Etym: The Middle English spelling of abbot, just the thing to go along with the Fat Friar.
Abercrombie, Euan (OotP ch. 11): A Gryffindor, 4 years behind Harry.
Etym: Last name of a British general who participated in the French and Indian Wars.
Aberforth Dumbledore: Etym: No name-specific info. Aber in Scottish placenames means "confluence" or "river mouth", so it could mean the location of Edinburgh-- at the mouth of the river Forth.
Abergavenny: A town in Wales where the Knight Bus dropped off a Madam Marsh.
Abraxan horse (OotP ch. 20): A variety of winged horses.
Etym: Looks like it's from Abraxas, a word used in magical amulets and later turned into a Gnostic deity, though what that implies I have no idea.
Abraxas Malfoy: Etym: See above.
Acanthia Way (OotP ch. 10): The address given in Little Norton for Doris Purkiss.
Etym: Various plants in the genus Acanthus; the leaf of A. spinosa became a popular classical decorative motif.
Accidental Magic Reversal Squad: An arm of the Ministry of Magic which rescues and restores the victims of splinching and other magical accidents.
Accio: The incantation for a Summoning Charm, usually followed by the name of the item summoned.
Etym: Latin, "I summon".
Achievement in Charming (OotP ch. 31): A book Hermione was studying for her O.W.L.s from.
Ackerley, Stewart [Acker] (GoF ch. 12): A Ravenclaw, three years behind Harry.
Etym: From a Middle English or German word for "field".
Acid Pops: A magical candy capable of actually burning a hole through one's tongue.
acromantula (HBP ch. 22): A giant talking spider, such as Aragog and his family.
Etym: Not sure, but my best guess is a conflation of acromegaly and tarantula.
Adalbert Waffling: Etym: No etymology found. Name of a bishop of Hamburg-Bremen, and a Lombard king of Italy.
Adrian Pucey: Etym: From Latin Hadrianus "of the Adriatic", name of an emperor and several popes.
Advanced Potion-Making (HBP ch. 9): The textbook for N.E.W.T.-level Potions.
Advanced Rune Translation (HBP ch. 7): The textbook for N.E.W.T.-level Ancient Runes.
Adventures of Martin Miggs, The Mad Muggle, The: A comic book series that Ron reads.
Agatha Timms: Etym: From Greek agathos, "good". St. Agatha is a martyr of possibly the 3rd century.
Age Line: A barrier which stops anyone below a certain age crossing it.
Aging Potion: Can age a person physically, but does not fool an Age Line.
Agnes (OotP ch. 23): A witch confined to the Janus Thickey Ward.
Etym: From Latin agnus, "sheep". In this case, a sheep in wolf's clothing.
Agrippa (PS ch. 6): Henrich Cornelius Agrippa von Nettesheim, at various times the secretary to Charles V, physician to Louis of Savoy, theologian, military entrepreneur, philosopher, orator, public advocate (discharged for defending an accused witch) and expert on occultism. His De occulta philosophia was one of the biggest influences on the Renaissance concept of magic, particularly Kabalism, and his writings and fame made him a figure in early versions of the Faust legend.
Featured in the Famous Witches and Wizards series of trading cards.
Aguamenti (HBP ch. 27): An incantation that produces water; may be the same as the Refilling Charm.
Etym: Combination of agua, Spanish for "water", and augment.
Aidan Lynch: Etym: Diminutive of Old Irish aid "fire".
akashic record: A New Age concept derived from Hindu occultism. An alternate dimension or invisible energy in which psychic vibrations of every object and event, past, present, and future, are stored, thus providing a mechanism for clairvoyance. I chose this name because all the good relevant ones were taken, and in the faint hope that perhaps I have managed to make a forward reference.
Alastor Moody: Etym: PN: "In Greek legend an avenging deity who drives the sinner to fresh crimes. Shelley's Alastor is, however, the Spirit of Solitude." Having seen what Moody thinks of Snape, that first part sounds rather ominous... Also used to name the target that the deity takes over, rather like Moody's form being used for evil purposes.
Alberic Grunnion: Etym: A Germanic name, formed from from oelf "elf" + riic "power".
Albert Runcorn: Etym: Germanic, adal "noble" + berht "famous".
Albus Dumbledore: Etym: From a root meaning "white". Cognate to Albion, a poetic term for Britain, usually translated as "White Isle".
Albus Severus Potter: Etym: See above.
Alderton, Arkie (DH ch. 13): Allegedly a well-known broomstick designer who married a Muggle, but the Ministry is looking into that.
Etym: Habitation name from at least five places in the UK.
Alecto Carrow: Etym: One of the Furies, the Greco-Roman goddesses of vengeance. This name means "unceasing (in anger)".
Alfred Cattermole: Etym: From oelf "elf" + roeed "counsel". A very popular name due to Alfred the Great, king of Wessex, who famously maintained the only Anglo-Saxon kingdom not conquered by the Danes.
Algie (PS ch. 7): Neville Longbottom's great-uncle who was forever trying to get Neville's magic to manifest itself.
Etym: Of Norman-French origin, meaning "with whiskers" or "mustaches".
Ali Bashir: Etym: Anglicization of an Arabic name derived from from `ala, "rise, ascend".
Alice Longbottom: Etym: From Old German athal "noble" + haidu "kind, sort"
Alicia Spinnet: Etym: Ultimately from Old German athal "noble" + haidu "kind, sort" (the equivalent to Modern English -hood).
Alohomora: Incantation for an unlocking charm.
Etym: Possibly Hawai`ian aloha "hello, goodbye", plus something I can't identify.
Alphard (Black?): Etym: A star whose common name means "the solitary one".
Amelia Susan Bones: Etym: ECN says it's derived from the Old German name element amal- "work", but OED claims it's from Latin melior "better". The intended etymology is probably the latter.
Ambrosius Flume: Etym: Related to ambrosia, idiomatically the most wonderful food.
Amortentia (HBP ch. 9): The strongest of all love potions.
Etym: From Latin roots meaning "love" and "to death".
Amos Diggory: Etym: From Hebrew for "carried", an Old Testament prophet with a message of doom.
Amy Benson: Etym: From Old French amée, "loved".
Amycus Carrow: Etym: A minor figure in the story of the Argonauts, a son of Poseidon who was famed as a boxer.
Anapneo (HBP ch. 7): An incantation to relieve choking.
Etym: Latinized form of Greek anapno- "respiration".
Ancient Runes: An elective subject at Hogwarts, which Hermione is taking.
Ancient Runes Made Easy: A book Hermione was reading to prepare for taking Ancient Runes.
Andrew Kirke: Etym: From the Greek for "manly"; also the name of the patron saint of Scotland and Russia. The saint's name is probably derived from a Hebrew name.
Andromeda Black Tonks: Etym: A mythical woman who was to be sacrificed to a sea monster because of her mother's boasting, saved by Perseus who killed the sea monster and an uncle who intended to marry her. In keeping with the astronomical names of the Black family, also the closest galaxy to our own.
Angelina Johnson: Etym: "Little angel"; also a tree of tropical America, a genus of Leguminosae, with showy purple flowers.
Angus Fleet: Etym: As a name, probably from Old Irish AEngus "one choice". Also a breed of cattle, a 9th century saint, and a minor mythical hero.
Animagus: A wizard who can transform at will (along with their clothes and anything they may be carrying) into a characteristic animal form which reflects their personality. The Ministry of Magic maintains a registry of Animagi, but unregistered ones abound. Animagi revealed so far are James Potter, Peter Pettigrew, Sirius Black, Rita Skeeter and, the only registered one mentioned here, Professor McGonagall.
Etym: I'm guessing this is not "animal mage" but "spirit mage", from Latin anima.
Anthology of Eighteenth-Century Charms, An: A book in the Hogwarts library.
Anthony Goldstein: Etym: Unknown. The name of a couple saints.
Anti-Cheating Charms (OotP ch. 31): Probably the same as the Anti-Cheating Spell, used on the O.W.L. exam papers.
Anti-Cheating Spell: Used on the quills the Hogwarts student use for their written exams. Probable mechanism: the pen senses when it's about to be used to write information obtained illicitly. Maybe if the student doesn't think they're cheating...
Anti-Disapparation Jinx (OotP ch. 36): A spell that disables the target's ability to Apparate.
Etym: The daughter of Oedipus and his mother Jocasta, who was sentenced to death for giving her brother Polyneices a decent burial.
Antioch Peverell: Etym: A city now known as Antakaya, in Turkey, which made its name as one of the major seats of Arianism, a strand of Christianity believing that the Holy Trinity were not all of the same substance. Also, Antiochus was a popular name in the Seleucid dynasty.
Antonin Dolohov: Etym: Cognate of Anthony, whose etymology is unknown. St. Anthony is the patron saint of swineherds.
Aparecium: Incantation to be used with a Revealer.
Etym: The closest thing I can find is apertum, Latin for "open, uncovered, accessible".
Apolline Delacour: Etym: Of or pertaining to Apollo, who was the god of music, but also death and terror at a distance.
Apparate: To perform an Apparation.
Apparation Test Center (OotP ch. 7): The arm of the Ministry of Magic that certifies people to allow them to perform Apparation.
Apparation: The act of teleporting from one place to another. The Ministry of Magic requires those who want to use it to pass a test and get a license, as it can be dangerous. The grounds of Hogwarts are enchanted to make Apparation impossible there.
Apparation Test (HBP ch. 18): Administered to wizards of age 17 or older, to determine whether they get a license to Apparate.
Apparition: Alternate spelling of Apparation in the Scholastic editions of HBP.
Appraisal of Magical Education in Europe, An: A book which contains information on Durmstrang and Beauxbatons.
Apollyon Pringle: Etym: A name for the Devil, meaning "destroyer". And we thought Filch was bad...
Aquavirius maggots (OotP ch. 34): Whatever they are, The Quibbler thinks the Ministry of Magic is breeding them.
Etym: Think it's from the Latin roots for "water" and "life".
Arabella Doreen Figg: Etym: A name of Scottish origin and unknown etymology, possibly from Latin Orabilis "easy to be entreated"; also the title character of a Strauss opera.
Aragog: A giant, intelligent, spiderlike creature (an acromantula) raised by Hagrid in his school days. Aragog now lives in the Forbidden Forest with his wife Mosag and their happy brood of scuttling flesh-eating spawn.
Etym: May be related to Gog and Magog, which among other things are the names of two giants in English legend, with ara- for "arachnid".
Araminta Meliflua: Etym: Started as an invented name, possibly conflated from Arabella and Aminta.
Archie [Archibald] (GoF ch. 7): A wizard in attendance at the Quidditch World Cup who is not entirely in tune with Muggle fashions.
Etym: From Old German ercan "genuine, simple" + bald "bold".
Arcturus Black, Regulus: Etym: The brightest star in Bootes, the name meaning "bear guardian".
Arcus (DH ch. 21): Wizard of old who may have had dealings with the Elder Wand.
Etym: Latin for "bow" (as in the implement, not the action).
Argus Filch: Etym: A figure from Greek myth with a hundred eyes, killed by Hermes, after which his eyes were transferred to the tail of the peacock. By extension, a vigilant person.
Argyllshire: A hilly and remote section of Scotland. The Fat Lady hid in a map of it after being attacked by Sirius Black.
Ariana Dumbledore: Etym: Goes back to Ariadne, who helped Theseus defeat the Minotaur and got no happiness out of it.
Arithmancy: An elective subject at Hogwarts which Hermione is now taking, taught by Professor Vector.
Arkie Alderton: Etym: See below.
Arkie Philpott: Etym: Might be short for Arkady, from Arcadia, or Arcas, mythological father of the Arcadians.
armadillo bile: Apparently, a basic potionmaking supply used by Hogwarts students.
Armando Dippet: Etym: From Old German harja "host, army" + mana "man".
Arnold (HBP ch. 7): Ginny's Pygmy Puff.
Etym: See below.
Arnold Peasegood: Etym: From Old German arin "eagle" + vald "power".
Arsenius Jigger: Etym: Arsenious means "of or relating to arsenic".
Arthur Weasley: Etym: From the name of the legendary king. Various Celtic derivations have been proposed, but most likely from a Roman gens named Artorius.
ash: Any tree of the genus Fraximus. Wood of the commercial varieties is stiff, strong, resilient, and lightweight, and frequently used in tool handles and sports equipment.
Arthur Weasley, Bill: Etym: See above.
asphodel: In poetic use, the narcissus; ancient references are to the genus Asphodelus. An ingredient for the Draught of Living Death.
Asiatic Anti-Venoms (OotP ch. 16): A book in the Hogwarts library.
Atmospheric Charm (DH ch. 12): Some sort of weather-regulating spell.
Aubrey, Bertram (HBP ch. 25): An unfortunate victim of the Marauders.
Etym: Comes from the Germanic name Alberic; might be named after John Aubrey, a Tudor-era chronicler and also the author of one of the first books on fairies and related spirits.
Augusta Longbottom: Etym: Feminine form of Augustus; see below.
Augustus Pye: Etym: See below.
Augustus Rookwood: Etym: Latin, meaning "venerable, consecrated".
Aurors: Wizards employed by the Ministry of Magic to hunt down users of dark magic. Frank Longbottom and Alastor Moody are ex-Aurors.
Etym: British slang calls policemen coppers. Auror could easily be from aureum, Latin for "gold".
Auror Headquarters (OotP ch. 7): Located in the Ministry of Magic.
Auto-Answer Quills (OotP ch. 31): A banned item at O.W.L. exams.
Avada Kedavra: Incantation for the Killing Curse.
Etym: Several Web sites (including an earlier version of this one, mea culpa) have given this as the root of abracadabra, originating as a Kabalistic term. Instead, it appears that abracadabra comes from Abraxas via Gnostic occultism, and I haven't been able to find anything on the origins of avada kedavra.
Avery: A Death Eater, left at large after claiming he had been a victim of the Imperius Curse, but imprisoned after the battle at the Ministry of Magic.
Etym: A variation of the Germanic name Alberic, from oelf "elf" + ric "power". John Avery was a renowned pirate of the late 17th century.
Avis: Incantation to conjure birds from one's wand.
Etym: Latin, "bird". Technically, should be the plural, aves.
Axebanger: The nickname of Rupert Brookstanton.
Axminster: A type of flying carpet used in Britain before carpets were added to the Registry of Proscribed Charmable Objects.
Etym: An Axminster carpet refers to a type originally made by a factory in Axminster, Devon, from 1755 to 1835.
Azkaban: A prison for users of dark magic, located in the North Sea, staffed by dementors.
Etym: Origin unknown. Invented?
Babbling Beverage (OotP ch. 32): A potion that makes the recipient spout nonsense.
Babbling Curse: Details unknown; Lockhart claimed to have cured a Transylvanian villager of it.
Baddock, Malcolm (GoF ch. 12): A Slytherin, three years behind Harry.
Etym: A diminutive of a Provençal name meaning "open-mouthed idiot".
Bagman, Ludo: A former Beater for the Wimbourne Wasps, a Death Eater allowed to remain free after pleading youthful misconduct, more recently the head of the Department of Magical Games and Sports, and most recently in hiding from goblin financiers who do not understand the term "debt restructuring".
Etym: The name means "one who carries a bag". In criminal jargon, can mean a money launderer, or someone who specializes in making inconvenienct people disappear.
Bagman, Otto (GoF ch. 5): Ludo Bagman's brother, who got into "a spot of trouble" with the Misuse of Muggle Artifacts Office over an enchanted lawnmower.
Bagnold, Millicent (OotP ch. 5): Fudge's predecessor as Minister of Magic.
Etym: From Old English beadu "battle" + halh "nook, recess" or holt "wood".
Bagshot, Bathilda (PS ch. 5): Author of A History of Magic.
Etym: A type of ammunition. Looking at this whole name, it appears the history of magic must have been pretty, um, exciting...
Ballycastle Bats: A British Quidditch team. Ballycastle may be a fictional place.
Bandon Banshee: Allegedly banished by Gilderoy Lockhart. A banshee is a wailing or singing demonic spirit; Bandon is a town in County Cork, Ireland.
Banishing Charm: The reverse of a Summoning Charm.
banshee: see Bandon Banshee.
Bane [Banes or Bain]:
Etym: Bunch of choices here: from a nickname meaning "bones"; a Welsh patronymic meaning "anvil"; Gaelic for "white, fair"; Middle English meaning "welcoming, friendly"; or Middle English/Old French meaning "bath". Or perhaps the character name is just from the modern English word.
Barnabas Cuffe: Etym: See below.
Barnabas Deverill: Etym: See below.
Barnabas Finkley: Etym: See below.
Barnabas Finkley Prize for Exceptional Spell-Casting (DH ch. 18): Won by Albus Dumbledore.
Barnabas the Barmy (OotP ch. 18): A wizard who attempted to train trolls to do ballet, commemorated in a tapestry opposite the Room of Requirement.
Etym: From bar "son" and Nabia, a name maybe meaning "confession". The name of a biblical missionary.
Barnsley (OotP ch. 1): An industrial town in Yorkshire (for the British perception of it, read "dour and boring"), location of the Five Feathers.
Barny Weasley: Etym: Short for Barnabas, but barney also means to cheat, or play unfairly.
Barry Ryan: Etym: From Irish bearrach "spear".
Bartemius Crouch: Etym: From Aramaic Bartholomew "son of Tolmai". No etymology on Tolmai.
Baruffio (PS ch. 10): A wizard infamous for misspeaking a charm and conjuring up a buffalo.
Etym: No etymology.
Baruffio's Brain Elixir (OotP ch. 31): Confiscated by Hermione from Eddie Carmichael.
Bashir, Ali (GoF ch. 7): A flying carpet merchant, upset that his wares are banned in Britain.
Etym: "Bringer of good news, messenger sent by Allah".
Basic Hexes for the Busy and Vexed: A book in the Hogwarts library.
Basil (GoF ch. 7): A wizard helping with logistics at the Quidditch World Cup.
Etym: From Greek basileios "kingly"; also the name for herbs of the genus Ocymum. There is a St. Basil, who was the bishop of Caesarea in the mid-4th century.
basilisk: A mythical creature supposed to spring from an egg laid by a rooster and incubated by a serpent or toad. Basilisks are usually depicted as snakelike, sometimes with a crown (its name derives from the Greek for "king") and are capable of turning any living thing to stone by looking at them.
The one which had been lurking in the Chamber of Secrets at Hogwarts is additionally in danger from the crowing of roosters, and generates an aura that sends spiders fleeing.
Bat-Bogey Hex (OotP ch. 6): A spell that summons winged imps to harass the target. A specialty of Ginny Weasley's.
Etym: Bogey or bogy is a term covering many different malicious folkloric spirits.
Bathilda Bagshot: Etym: OED has an entry for batilde, an obsolete form of a word meaning "embattled".
Bayliss, Hetty (CoS ch. 5): A Muggle who spotted the flying Ford Anglia.
Etym: From Late Latin baiulus "carrier, porter", cognate to bailiff.
Beast Division (OotP ch. 7): A section of the Ministry of Magic for dealing with magical creatures.
Beater: A member of a Quidditch team who deflects Bludgers away from their teammates (and, ideally, toward the opponents).
Beauxbatons Academy: A school of wizardry which participates in the Triwizard Tournament; its current headmistress is Olympe Maxime. Its students speak with French accents, wear silk robes, and move in a balletic manner. (Ballet is absolutely essential to the British stereotype of the French.)
Etym: French, "lovely wands".
Bedazzling Hex (DH ch. 21): Something that works as well as invisibility, for a while.
beechwood: Various trees of the genus Fagus, all tall, wide-spreading, and preferring temperate climes. The wood is durable under water, and used for cabinetry, tool handles, and shipping containers. Also cultivated as a shade tree.
Beedle the Bard (DH ch. 7): The fabulist behind Tales of Beedle the Bard.
Etym: A beadle is a herald, crier, or messenger.
Befuddlement Draught (OotP ch. 18): A potion that creates hot-headedness or recklessness.
Beginner's Guide to Transformation, A: The first-year textbook for Transfiguration.
Being Division (OotP ch. 7): A section of the Ministry of Magic for dealing with magical sentients.
Belby, Marcus (HBP ch. 7): A member of the Slug Club because of his uncle Damocles. One year ahead of Harry.
Etym: Couldn't find anything.
Belcher, Humphrey (HBP ch. 10): According to Dumbledore, the man who believed the time was right for a cheese cauldron.
Etym: From Old French bel "lovely" + chere "face, countenance", or a variation on a name meaning "beam". Also the last name of a caricaturist for Punch.
Belch Powder: Something that can be gotten in Hogsmeade, probably from Zonko's Joke Shop.
Bell, Katie (PS ch. 12): A Chaser on the Gryffindor Quidditch team, and a member of Dumbledore's Army.
Etym: Does in fact come from Middle English for "bell".
belladonna: Atropa belladonna, deadly nightshade, the "essence" of which probably refers to atropine.
Bellatrix Black Lestrange: Etym: The name of a star; the name also means "female warrior".
Etym: Literally, Hebrew for "son of the south", interpreted as "son of the right hand". Allusively, the favored son or the best share.
Benson, Amy (HBP ch. 13): A child in the same orphanage as Tom Riddle, somehow harmed by him.
Etym: Patronymic deriving from Benedict "blessing", or from an Old English placename meaning "Banesa's settlement".
Bertha Jorkins: Etym: From Old English for "bright".
Bertie Bott's Every Flavor Beans: Jellybean-like magical candies of any flavor imaginable... including the ones you don't want to imagine.
Etym: From Old German words berhta "bright" + hraben "raven"; the name of the family in Mansfield Park, which also gave us Mrs. Norris.
Bertram Aubrey: Etym: See above.
Bethnal Green (OotP ch. 7): An area of London, the site of the third regurgitating toilet incident.
Betty Braithwaite [Elizabeth]:
Etym: See Elizabeth. Also, to betty is to fuss about.
bezoar: This term has been applied to various substances believed to be universal antidotes, but most commonly to a concretion formed around foreign matter in the gut of certain ruminants. Originally these were taken from the wild goat and antelope of Persia, which are also known as the bezoar goat and bezoar antelope.
bicorn: A creature from early French and English literature, it subsisted by devouring virtuous husbands. Powdered bicorn horn is one of the ingredients of the Polyjuice Potion.
Bilius (PoA ch. 6): One of Neville's uncles. He died a day after seeing a Grim.
Etym: Probably a variation of bilious.
Bilius, Ron Weasley: Etym: See above.
Etym: From Old German vilja "will" + helma "helmet".
Etym: See above.
billywig (DH ch. 21): Another marvelous creature from the pages of The Quibbler.
Etym: Probably an insect of some sort, by analogy with earwig.
Binky (PoA ch. 8): Lavender Brown's rabbit, killed by a fox.
Binns, (first name unknown): The teacher of the History of Magic classes at Hogwarts, and unusual among history teachers for being as dead as his lectures.
Etym: From the Old English name Binna, of uncertain origin, or a word for an open manger, stall, or hollow place.
Bishop, Dennis (HBP ch. 13): Another of Tom Riddle's fellow orphans, which he did something to.
Etym: Means what it looks like.
Black Forest: An area in Germany.
Black(?), Alphard (OotP ch. 6): Sirius's uncle, estranged from the family for supporting him.
Etym: See below.
Black(?), Elladora (OotP ch. 6): Sirius's aunt, who started the family tradition of beheading elderly house-elves.
Etym: See below.
Black Lestrange, Bellatrix: Etym: See below.
Black, Madam (OotP ch. 4): Sirius's mother, technically dead but still very much a presence through her portrait.
Etym: See below.
Black Malfoy, Narcissa: Etym: See below.
Black, Regulus Arcturus (OotP ch. 6): Sirius's younger brother, a Death Eater during the first wizard war and not terribly good at it either.
Etym: See below.
Black, Sirius: Harry's godfather and a member of the Order of the Phoenix, imprisoned in Azkaban for years after being framed by Peter Pettigrew, and now unfortunately and rather confusingly dead.
Etym: Just means black. As a side note, though, some instances of this surname come from Old English blac, the equivalent of French blanc... meaning "white"!
Black Tonks, Andromeda: Etym: See above.
blackthorn: Prunus spinosa, a dense, spiny plant, used mostly as a hedge. The fruits are also used to flavor a type of gin.
bladvak: The Gobbledygook word for "pickax".
Blaise Zabini: Etym: Full etymology unknown but cognate to Blasius, the name of the patron saint of wool-workers and sufferers of throat diseases. Once very popular in England, a major wool producer. ECN: "The only relic of the trade in Romsey, Hants (once a wool staple), is an inn called the Bishop Blaise."
Blast-Ended Skrewts: A cross between fire-crabs and manticores used by Hagrid for the Care of Magical Creatures class.
Blaze Box (OotP ch. 28): A unit of Weasleys' Wildfire Whiz-Bangs.
Bletchley, Miles (PS ch. 11): The Keeper for the Slytherin Quidditch team in Harry's first year.
Blibbering Humdinger (OotP ch. 13): Another creature only {The Quibbler believes in.
Blood Blisterpod (OotP ch. 14): One of the components of the Skiving Snackbox.
Blood Brothers: My Life Amongst the Vampires (HBP ch. 15): Eldred Worple's account of vampire life.
Blood-Replenishing Potion (OotP ch. 22): A treatment for hemorrhages at St. Mungo's Hospital, apparently obviating the need for transfusions.
Blood Status (DH ch. 11): Legitimacy in the eyes of the pureblood regime at the Ministry of Magic.
Blood-Sucking Bugbear: What Hagrid thought might be killing his roosters. A bugbear in popular legend is a monster in the shape of bear said to devour naughty children.
Bloody Baron: The house ghost of Slytherin.
Bludger: A small, hard ball used in Quidditch. Bludgers fly around the field of play attempting to knock players off their brooms.
Etym: Undoubtedly from bludgeon. OED has an entry for bludger, actually, but in the interest of preserving our G rating we must move on.
bluebell fire: A magically conjured blue fire that can be carried around in a jar.
Bluebottle: A type of flying broom, advertised as "A Broom for the Whole Family."
Boardman, Stubby (OotP ch. 10): According to the The Quibbler, Sirius Black's real name, under which he was the lead singer of The Hobgoblins.
Etym: Originally a name for a person who lived on the edge of a town, from Middle English border "edge".
Etym: See Roberts.
Bobbin, Melinda (HBP ch. 11): A student at Hogwarts whose family owns a large chain of apothecaries.
Etym: A spool of thread, or a small bundle of wood.
Bode, Broderick (GoF ch. 7): An Unspeakable who was at the Quidditch World Cup.
Etym: From the Germanic word "to announce", meaning much the same as the English word bode.
Body-Bind: A curse that paralyzes the target completely. Incantation: Petrificatus Totalus.
Bodrod the Bearded (GoF ch. 31): May have been a participant in a historical goblin rebellion.
Etym: No info; probably invented.
boggart: In these books, a creature that assumes the appearance of whatever a person looking at it fears most. Can be banished with a humorous mental image and the incantation Riddikulus.
Bogrod (DH ch. 26): A Gringotts employee.
Etym: Probably invented.
Bole (PoA ch. 15): A Beater on the Slytherin Quidditch team.
Etym: Something of a cylindrical shape, such as the trunk of a tree or a pillar. As a name, an anglicized form of Ó Baoighill, possibly from words meaning "rash pledge", or derived from the placename Boyville.
Bonaccord, Pierre (OotP ch. 31): The first Supreme Mugwump of the International Confederation of Wizards.
Etym: French, "good agreement".
Bonder (HBP ch. 2): The caster of the spell cementing an Unbreakable Vow.
Bones, Amelia Susan (OotP ch. 7): An official at the Wizengamot, killed by the Death Eaters.
Etym: Derived via Yiddish from Italian bona "good".
Bones, Edgar (OotP ch. 9): A member of the Order of the Phoenix who was killed by the Death Eaters along with other members of his family.
Etym: See above.
Bones, Susan (PS ch. 7): A Hufflepuff, in the same year as Harry, and a member of Dumbledore's Army.
Etym: See above.
Bonfire Night: November 5th, in England the commemoration of the Gunpowder Plot. Typically involves lots of fireworks.
Boot, Terry (PS ch. 8): A Ravenclaw, the same year as Harry, and a member of Dumbledore's Army.
Etym: From Middle English for "boot" or Dutch for "boat".
Borage, Libatius (HBP ch. 9): Author of Advanced Potion-Making.
Etym: A group of plants in the genus Boraginaceae. The main British species is used to make cordial, and as a flavoring for alcoholic drinks.
Borgin and Burkes: A shop in Knockturn Alley specializing in the ingredients of dark magic; Evil backwards-R Us.
Etym: No info on Borgin, but perhaps it's supposed to sound like Borgia. The name Burke comes from Old High German burg "fortification". A likelier source for the store's name, however, is the 19th-century murderer and grave-robber William Burke.
Borgin, Mr. (CoS ch. 4): One of the founders of Borgin and Burkes, still working there, or else a descendant.
Etym: See above.
Boris the Bewildered (GoF ch. 23): A statue of him is near the prefects' bathroom.
Etym: Russian name of uncertain etymology; may signify "fight".
Bottom Bridge (DH ch. 20): A place that might be near the Lovegood residence.
Etym: Bottom is an archaic word for "valley". Probably not a real location in this case, though there are a lot of Such-and-Such's Bottom Bridges out there.
bouillabaisse: A fish stew whose characteristic form originated in France.
Bouncing Bulbs: Some sort of plant covered in the Herbology class.
bowtruckle (OotP ch. 13): Twig-like creatures that guard trees with wand-quality wood.
Etym: Possibly bow as in "bend" + the obsolete word truckle "be subservient, yield, be daunted".
Bozo (GoF ch. 24): Rita Skeeter's photographer.
Bradley (OotP ch. 31): A Chaser on the Ravenclaw Quidditch team.
Etym: Possibly after Francis Herbert Bradley, an idealist philosopher.
Braithwaite, Betty (DH ch. 2): A Daily Prophet reporter who seems to be only slightly less wonderful than Rita Skeeter herself.
Etym: brath is a dialect word meaning "impetuous, violent, wrathful". The name itself is one of those boring habitation names, from Old Norse breiðr "broad" + þveit "clearing".
Branstone, Eleanor (GoF ch. 12): A Hufflepuff, three years behind Harry.
Etym: From the Old English name Brant + tuun "enclosure, settlement".
Break with a Banshee: One of Gilderoy Lockhart's books.
Brian Dumbledore, Albus Percival Wulfric: Etym: Brian Boru, the legendary high king of Ireland.
Bring-and-Fly Sale (OotP ch. 15): The wizard variant of a "Bring and Buy Sale", a sort of community flea market organized in aid of a church, school, or community center.
British and Irish Quidditch League (OotP ch. 7): The league in which the professional Quidditch teams listed here play; its headquarters are at the Ministry of Magic.
Brockdale Bridge (HBP ch. 1): A bridge which collapsed unexpectedly, killing an unreported number of Muggles.
Brockelhurst, Mandy (PS ch. 8): A Ravenclaw, the same year as Harry.
Etym: Placename, after a wooded hill that was home to badgers. Brock on its own has been a word for various small animals, including badgers.
Broderick Bode: Etym: None found.
Broken Balls: When Fortunes Turn Foul: A book on divination at Flourish and Blotts.
Brookstanton, Rupert "Axebanger" (HBP ch. 30): A former Hogwarts student.
Etym: I was able to find that Stanton from Old English staan "stone" + tuun "enclosure".
brooms: The flying broom is an ancient and venerable mode of wizard transportation, and an indispensable part of Quidditch. Types of brooms include the Bluebottle, Cleansweep Five, Cleansweep Seven, Cleansweep Six, Comet Two Ninety, Comet Two Sixty, Firebolt, Nimbus Two Thousand, Nimbus Two Thousand and One, Silver Arrow, and Shooting Star.
Broom Compass (OotP ch. 23): Presumably a compass that can be mounted on a broom.
Broom Regulatory Control (OotP ch. 7): An arm of the Ministry of Magic.
Brown, Lavender (PS ch. 8): A Gryffindor, the same year as Harry, a founding member of Dumbledore's Army.
Etym: Really means "brown".
brown owl: A very common European owl, known most commonly as the tawny owl.
Bryce, Frank: The gardener at the Riddle House, killed by Voldemort, brought back as a shade.
Etym: No etymology; suspected to be of Celtic origin.
Bubotuber: A magical plant useful for making an acne remedy.
Etym: Bubo as in bubonic plague; there is a plant structure called a bulbo-tuber, which is neither a true bulb nor a true tuber.
Buckbeak: A hippogriff falsely accused of being dangerous, now on the run with Sirius Black.
Etym: Probably invented.
budgie: A small yellow bird, very popular as a pet in Britain at one time, less common these days.
Budleigh Babberton (HBP ch. 4): Horace Slughorn's last hiding place before he was lured back to Hogwarts.
Etym: There is no such place, although there is a Budleigh Salterton.
bugbear: see Blood-Sucking Bugbear.
Building Society (DH ch. 9): A cooperative savings society, originally for working-class men to pool their savings to make loans to members of the group. Roughly similar to a credit union in the US.
Bulbadox Powder (OotP ch. 12): A powder that causes boils.
Etym: From Latin roots meaning "rounded object" and "inflate".
Bulstrode, Millicent (PS ch. 8): A Slytherin, the same year as Harry.
Etym: A place name, from Old English burh "fortress, town" or bula "bull" + strood "brushwood".
Bungs, Rosalind Antigone (HBP ch. 30): A former Hogwarts student.
Etym: A bung can be a stopper, or the mouth of a cask, or a brewer, pickpocket, or lie. Circa 1900, it was also slang for a bribe.
Bungy (OotP ch. 1): A budgie who lives at the Five Feathers who has learned to water-ski.
Burbage, Charity (DH ch. 1): The Muggle Studies teacher at Hogwarts through the end of Harry's sixth year. Now you see what leading a quiet, unadventurous life leads to.
Etym: The name comes from Old English burh "fort" + boec "hill", but she might be named for the builder of the Globe and Blackfriars Theaters.
Burke, Caractacus: One of the founders of Borgin and Burkes.
Etym: See under Borgin and Burkes.
Burning Day: The day on which a phoenix renews itself.
Burrow, The: The house of the Weasley family.
butterbeer: A popular drink at the Three Broomsticks, nonintoxicating to humans, but with a strong effect on house-elves.
Cadwallader (HBP ch. 19): A Chaser for Hufflepuff.
Etym: Welsh cad "battle" + gwaladr "leader".
Cadogan, Sir: A knight whose portrait was temporarily moved to guard the Gryffindor dormitory when the Fat Lady was frightened off.
Etym: From the Old Welsh name Cadoc, which is possibly related to a word meaning "battle".
Callisto (OotP ch. 14): One of the Galilean moons of Jupiter.
Calming Draught (OotP ch. 27): A soothing potion.
Canary Creams: A pilot product for Weasley's Wizard Wheezes which turns the eater into a giant canary.
Caput Draconis: The first password to the Gryffindor tower when Harry arrives at Hogwarts.
Etym: Latin for "dragon's head".
Caractacus Burke: Etym: See below.
Caradoc Dearborn: Etym: The Celtic form of Caratacus, the name of a British chieftain who led resistance against the Romans.
Care of Magical Creatures: An elective class at Hogwarts, taught by Professor Kettleburn until Harry's third year, when Hagrid took over. Harry, Ron, and Hermione are all enrolled in it.
Carmichael, Eddie (OotP ch. 31): A Ravenclaw, one year ahead of Harry.
Etym: From Britonnic ker "fort" + Michael.
Carrow, Alecto: A Death Eater and Muggle Studies professor in what would have been Harry's seventh year.
Etym: Obsolete word meaning "gambler".
Carrow, Amycus: A Death Eater and Defense Against the Dark Arts professor in what would have been Harry's seventh year.
Etym: See above.
Cassandra Trelawney: Etym: See below.
Cassandra Vablatsky: Etym: In Greek legend, Cassandra was given the gift of prophecy by the god Apollo, who loved her, and then cursed by him when she rejected him. The curse was that no one would ever believe her predictions.
Cauldron Cakes: A type of wizard candy, probably something akin to a cupcake.
Cattermole, Alfred (DH ch. 13): One of Reg and Mary's children.
Etym: Unknown origin, might be Low German.
Cattermole, Ellie (DH ch. 13): Another of Reg and Mary's children.
Etym: See above.
Cattermole, Maisie (DH ch. 13): Yet another of Reg and Mary's children.
Etym: See above.
Cattermole, Mary Elizabeth (DH ch. 13): Reg Cattermole's wife, and a damn good witch if she was really able to steal her powers at the age of eleven.
Etym: See above.
Cattermole, Reg (DH ch. 12): An employee of Magical Maintenance.
Etym: See above.
Cave Inimicum (DH ch. 14): Incantation to some sort of warding spell.
Etym: Latin, "beware the malicious person".
Cauldwell, Owen (GoF ch. 12): A Hufflepuff, three years behind Harry.
Etym: The name of several places, variously spelled but all from Old English c(e)ald "cold" + well(a) "spring". As a common noun, a weir that diverts water into a mill-lead.
Cecilia (HBP ch. 10): Tom Riddle senior's girlfriend, until he was stolen away by Merope Gaunt.
Etym: From Latin caecus, "blind". The saint of that name is the patron of musicians and music.
Cedric Diggory: Etym: ECN: "This now not uncommon name seems to have been invented by Sir Walter Scott for one of the characters in Ivanhoe, `Cedric the Saxon'. It was probably a mistake of Scott's for Cerdic, the name of the traditional founder of the West Saxon kingdom." Which may in turn be from the Welsh name Caradawg, meaning "amiable".
Celestina Warbeck: Etym: This was the term for a late-18th-century keyboard instrument developed from the armonica. The word is from Latin caelestis "heavenly".
centaur: A mythical creature with the body of a horse, and the top half of a human attached where the neck would be. Rowling's centaurs are largely peaceful but wish to keep to themselves. A group of them lives in the Forbidden Forest.
Chamber of Secrets: An enormous magical cavern, rumored to have been constructed by Salazar Slytherin, concealed beneath Hogwarts for nearly eight centuries, even when a modern girls' bathroom was built over the entrance, until Tom Riddle figured out how to open it and pin the blame on Hagrid.
chamberpot room: Dumbledore claims to have stumbled into a hidden room filled with solid gold chamberpots one night when he was heading for the bathroom. This was in fact the Room of Requirement.
Chambers (OotP ch. 31): A Chaser on the Ravenclaw Quidditch team.
Etym: From Middle English/Old French cha(u)mbre "chamber, room".
Chameleon Ghoul: Mentioned in passing, presumably a type of ghoul with some natural ability to disguise itself.
Chang, Cho: A Ravenclaw, a year ahead of Harry, and Seeker for the Ravenclaw Quidditch team. Briefly Harry's girlfriend, and may still be a member of Dumbledore's Army.
Etym: No reliable info.
Charing Cross Road: A major road in London. The Leaky Cauldron is apparently located along or near it.
Charity Burbage: Etym: Exactly what it looks like.
Etym: From ceorl, Old English for "a man".
Charm to Cure Reluctant Reversers, A: Page 12 of the Handbook of Do-It-Yourself Broomcare.
Charms: One of the basic subjects that all students at Hogwarts have to study, taught by Professor Flitwick. A general term for all sorts of minor spells of instantaneous effect.
Charm Your Own Cheese: One of Molly Weasley's cookbooks.
Chaser: One of the three players on a Quidditch team who pass the Quaffle between them and attempt to throw it through one of the goal hoops. A goal is worth 10 points.
Cheering Charm: A charm to elevate someone's mood.
Chinese Chomping Cabbage (OotP ch. 16): Sounds like a special variety of Chinese cabbage that you don't want to mess with.
Chinese Fireball: A variety of dragon.
chipolata: A type of sausage.
Cho Chang: Etym: No reliable info on the meaning of the name. It was the family name of a couple of Korean artists of the Yi dynasty.
Chocoballs: A candy available at Honeydukes.
Chocolate Frogs: A wizard candy, undistinguished except for the line of Famous Witches and Wizards trading cards that come with them.
chocolate gateau: A type of chocolate cake. Here's an example, although I'm not sure how representative it is.
Chorley, Herbert (HBP ch. 1): A junior minister who was for some reason hit with an Imperius Curse.
Etym: Related to several placenames, all derived from Old English ceorla "churl, peasant" + leeah "wood, clearing".
Christmas pudding: A rich fruit pudding, typically splashed with brandy and set alight just before serving. Hiding a silver coin in it is also traditional.
Christmas rose (DH ch. 16): Helleborus niger, a flower that blooms in late autumn to early spring, but most around Christmas.
Chudley Cannons: A professional Quidditch team. Chudley itself appears to be fictional, unless it's an alternate spelling of Chudleigh.
Ciceron Harkiss: Etym: Later form of Cicero. There's also cicerone, a guide to local antiquities and curiosities.
Circe: An enchantress who figures in the Odyssey. She transformed Odysseus's crew into pigs. Featured on a Famous Witches and Wizards trading card.
Clankers (DH ch. 26): A signal for Gringotts dragons to get the hell out of the way. Now every thief that goes in there is going to be carrying a bag of random metal.
Clapham (OotP ch. 14): Sturgis Podmore's hometown.
Class C Non-Tradeable Substance (OotP ch. 9): Venemous Tentacula seeds are included in this category.
Cleansweep Five: A type of flying broom.
Cleansweep Seven: A type of flying broom.
Cleansweep Six (OotP ch. 10): Yet another variety of flying broom.
Clearwater, Penelope (CoS ch. 14): Percy Weasley's girlfriend, a Ravenclaw prefect.
Etym: Pretty much what it looks like, and like her first name, a symbol of purity. Just the girl for Percy...
Cliodna: A druid featured on a Famous Witches and Wizards trading card.
Cloak of Invisibility (DH ch. 21): The proper name of one of the Deathly Hallows.
cobbing: A penalizable infraction in Quidditch-- excessive use of elbows toward opponents.
Etym: The word is first noted as a term for a nautical punishment in the late 18th century, taking on the more general meaning "to strike" in the mid-19th.
cockatrice: In antiquity, originally another name for a basilisk. Later on, a creature with the head, wings, and feet of a rooster, a serpentine body, and a barbed tail.
Cockroach Cluster: A candy available at Honeydukes.
Etym: Likely from a product of the same name mentioned in the Monty Python "Crunchy Frog" sketch (series 1, episode 6).
Cokeworth: Location of the Railview Hotel.
Cole, Mrs. (HBP ch. 13): The head of the orphanage that took in Tom Riddle.
Etym: From Old English col "charcoal".
Colin Creevey: Etym: Anglicization of Gaelic Cailean, which may be from coileán, meaning "young dog, youth" and by extension "cadet".
Colloportus (OotP ch. 35): A spell to seal a door.
Etym: I think this is intended to be from Latin roots meaning "bring together" and "door" (actually "gate").
Color-Change Charm (OotP ch. 31): Something Harry mixed up with a Growth Charm.
Come and Go Room (OotP ch. 18): Another name for the Room of Requirement.
Etym: Probably refers to how sometimes it's there and sometimes it isn't.
Comet Two Ninety (OotP ch. 9): A brand of flying broom.
Comet Two Sixty: A brand of flying broom.
Committee for the Disposal of Dangerous Creatures: Part of the Ministry of Magic. "Disposal" usually consists of killing the animal.
Committee on Experimental Charms: Part of the Ministry of Magic.
Common Apparition Mistakes and How to Avoid Them (HBP ch. 22): A leaflet available from the Ministry of Magic.
Common Magical Ailments and Afflictions: May or may not be an actual book available in the wizarding world.
Common Welsh Green: A type of dragon native to the British Isles.
Compendium of Common Curses and Their Counter-Actions, A (OotP ch. 18): A book that Dumbledore's Army found in the Room of Requirement.
Confronting the Faceless (HBP ch. 9): A book Hermione had to read for her Ancient Runes class.
Confundus Charm: A spell that can be used to temporarily make a person believe something they would otherwise disbelieve.
Confusing Concoction: A type of potion Harry had to make for his final exam in his third year.
Confusing Draught (OotP ch. 18): Probably the same thing as the Confusing Concoction.
Conjunctivitis Curse: Conjunctivitis is inflammation of the conjunctiva-- the inner membrane of the eyelid.
Conjuring Spells (OotP ch. 13): What it sounds like.
conk: British slang for "nose".
Connolly (GoF ch. 8): A Beater on the Irish national Quidditch team.
Etym: Anglicized form of Ó Conghalaigh, from a name meaning "valiant".
Coote, Ritchie (HBP ch. 11): One of Fred and George's replacements as Beater on the Gryffindor Quidditch team.
Etym: From Middle English co(o)te "coot", used because of the bird's reputation as a nickname for a stupid or bald man.
Cormac McLaggen: Etym: From Gaelic corb "defilement, valley" + mac "son".
Cornelius Oswald Fudge: Etym: St. Cornelius was pope from 251 to 253, and is noted for taking a liberal attitude toward Christians who had renounced their faith under duress. He was succeeded by St. Lucius.
Corner, Michael (OotP ch. 16): A Ravenclaw, a member of Dumbledore's Army and Ginny's ex-boyfriend.
Etym: Originally meant "hornblower", or referred to someone who lived at the corner of two streets.
Cornish pasty: A pasty is a small pastry filled with meat, potatoes, and vegetables. Pronounced to rhyme with "nasty".
Cornish pixies: Small electric-blue creatures; not terribly dangerous, although they seem to have a talent for vandalism.
counterjinx (OotP ch. 15): Term for any spell when it is used in opposition to a curse.
Courtroom Ten (OotP ch. 7): Where the hearing on whether to ban Harry from using magic was held.
Crabbe senior (GoF ch. 33): A Death Eater still at large, at least until the battle at the Ministry of Magic.
Crabbe, Vincent: One of Draco Malfoy's cronies, a Beater on the Slytherin Quidditch team for a while, killed along with a Horcrux by friendly Fiendfyre.
Etym: From a nickname for someone with an odd gait, like a crab, or a cantankerous person, as a shortening of crabapple.
Cragg, Elfrida (OotP ch. 22): A witch whose portrait hangs in St. Mungo's Hospital.
Etym: From the same root as crag, originally a name for someone living near one.
Cresswell, Dirk (HBP ch. 4): A Muggle-born student in the year after Lily Evans, who is now the head of the Goblin Liaison Office.
Etym: From Old English coerse "watercress" + well(a) "spring, stream".
Cribbages Wizarding Crackers: A magical version of Christmas crackers-- traditional British party favors consisting of a wrapped tube containing a surprise.
Creevey, Colin: A Gryffindor, a year behind Harry; Harry's first papparazzo. A member of Dumbledore's Army.
Etym: Anglicized form of Gaelic Ó Craoibhe, from a name meaning "curly(-headed)" or "prolific". Thomas Creevey (1768-1838) was a politician and placeman, remembered because some of his journals and correspondence were published in 1903 and 1905.
Creevey, Dennis: A Gryffindor, 3 years behind Harry, and a member of Dumbledore's Army.
Etym: See above.
crinolines: Clothing made with crinoline, a stiff fabric made of horsehair that was used primarily in the 19th century. At first it was used in hats and shoes, and later to make dresses, petticoats, and other things as a substitute for stiffened muslin.
crisps: Bits of pastry made by deep-frying batter.
Croaker (GoF ch. 7): An Unspeakable seen at the Quidditch World Cup.
Etym: As a common noun, one who talks dismally or despondingly, or who forebodes or prophesies evil. Makes you worry what they're up to in the Department of Mysteries.
Crockford, Doris (PS ch. 5): A particularly effusive fan of Harry's that he met in The Leaky Cauldron.
Etym: From the placename Crockford Bridge; further etymology is uncertain and probably not relevant. Also the name of a London gambling club, and the colloquial designation of a reference work produced by the Anglican Church.
Crookshanks: Hermione's unusually intelligent (because he's part Kneazle) cat.
Etym: Means "crooked legs".
Crouch, Bartemius, junior: A convicted Death Eater who was snuck out of Azkaban by his father and went on to repay him by mind-controlling him, usurping his identity, and eventually killing him.
Etym: In addition to the usual meanings, an obsolete form of cross; name for someone who lived near a cross.
Crouch, Bartemius, senior: The former head of the Department of Magical Law Enforcement, later Percy Weasley's boss in the Department of International Magical Cooperation, still later killed by his own son.
Etym: See Crouch junior.
Cruciatus Curse: One of the Unforgivable Curses, it causes unbearable pain to the target. Prolonged exposure can apparently result in memory loss, as for the Longbottoms. Incantation: Crucio.
Crucio: The incantation for the Cruciatus Curse.
Etym: Latin, literally "I crucify". The same word at the root of exruciating. Imperative: crucire "be crucified".
Crumple-Horned Snorkack (OotP ch. 26): A possibly imaginary beast of burden that may live in Sweden and be very good at finding where its rider wants to go.
Etym: I think the Snorkack part is onomatopoeic.
crup (OotP ch. 15): A creature that resembles a Jack Russell terrier with a forked tail.
Etym: An archaic word with various meanings related to the hindquarters or the tack on that part of a horse; also Kentish dialect meaning "brittle, short, snappish".
Cuffe, Barnabas (HBP ch. 4): The editor of the Daily Prophet.
Etym: Perhaps he makes off-the-cuff remarks.
curses: Spells that injure or impede the target. Some require only a wand and a quick incantation, but stronger ones require the caster to maintain line-of-sight and keep up the incantation for the full time of effect. The terms jinx and hex appear to be equivalent, and are used in curse names for alliterative effect. : A book seen in Diagon Alley.
Curse of the Bogies: Something Professor Quirrell mentioned in class. Bogie has varied meanings, a lot of them overlapping with boggart.
Cuthbert Mockridge: Etym: St. Cuthbert (d. 687) was bishop of Lindisfarne and is one of the most popular saints in northern England. Also a term for a conscientious objector in World War I.
Dagworth-Granger, Hector (HBP ch. 9): Founder of the Most Extraordinary Society of Potioneers.
Etym: Couldn't find anything on Dagworth; see Granger for that etymology.
Dai Llewellyn Ward (OotP ch. 22): A ward for bite victims at St. Mungo's Hospital.
Etym: Named for "Dangerous" Dai Llewellyn, whoever he is.
Daily Prophet: A daily newspaper, the primary news source for most British wizards.
Damocles (Belby?) (HBP ch. 7): Marcus Belby's uncle, one of Horace Slughorn's former students, who went on to invent the Wolfsbane Potion.
Etym: A courtier in Greek myth who, to make a point about how precarious life is, found himself under the famous dangling sword.
dandelion juice (OotP ch. 38): Apparently a perfectly ordinary drink for wizards.
Daphne Greengrass: Etym: A nymph who escaped Apollo's advances by being turned into a laurel, which ever after was sacred to Apollo. From this came the use of the laurel as an award for achievement.
Dark Arts Outsmarted, The (OotP ch. 18): A book found in the Room of Requirement.
Dark Force Defense League: An organization of which Gilderoy Lockhart is an honorary member. It may be some sort of vigilante group.
Dark Forces, The: A Guide to Self-Protection: The first-year textbook for Defense Against the Dark Arts.
Davies, Roger (PoA ch. 14): Captain of the Ravenclaw Quidditch team.
Etym: From the Hebrew name David, meaning "beloved". Sarah Emily Davies (1830-1921) was a pioneer in the movement to allow women into colleges, and was the founder of Girton College, Cambridge.
Etym: Hebrew, meaning "beloved". St. David is the patron saint of Wales.
Dawlish (OotP ch. 27): An Auror who came to arrest Dumbledore in Harry's fifth year, and later was assigned to guard Hogwarts anyway.
Etym: Might be related to dawly, a dialect word in northern England meaning "miserable, gloomy, lonely".
Daydream Charm (HBP ch. 6): A product created by Weasley's Wizard Wheezes to make classes more pleasant.
Dean Thomas: Etym: From Middle English dene "valley", or deen, a borrowing of a word that ultimately meant "a leader of ten men".
Dearborn, Caradoc (OotP ch. 9): Etym: None found, but might just be from dear and born.
deathday: The date on which a ghost comes into being, or the anniversary of that date. Like a birthday, a cause for celebration.
Death Chamber (OotP ch. 35): The room in the Department of Mysteries where Sirius Black died.
Death Eaters: Voldemort's merry band of evildoers, now nearly all killed or captured.
Killed in the first war: Evan Rosier, Wilkes
Killed in Voldemort's service since: Bartemius Crouch junior,
Bellatrix Lestrange
Either killed or captured: Alecto Carrow, Amycus Carrow,
Avery, Crabbe senior, Antonin Dolohov, Gibbon, Fenrir Greyback,
Goyle senior, Jugson, Rabastan Lestrange
Rodolphus Lestrange, Walden Macnair, Lucius Malfoy,
Mulciber, Nott senior, Rookwood, Travers, Yaxley
Whereabouts unknown: Ludo Bagman
Renounced Voldemort (and killed) in the first war: Regulus Black
Renounced Voldemort (and killed) since: Igor Karkaroff,
Peter Pettigrew (sorta), Severus Snape
Deathly Hallows (DH ch. 20): The Elder Wand, the Resurrection Stone, and the Cloak of Invisibility. If you have seen any of these items, please contact Death.
Death Omens: What to Do When You Know the Worst is Coming: A book in Flourish and Blotts.
Deathstick (DH ch. 21): A colloquial but much cooler name for the Elder Wand.
Decoy Detonator (HBP ch. 6): A Weasley's Wizard Wheezes product which provides a convenient nearby distraction when you need one.
Decree for Justifiable Confiscation (DH ch. 7): A law allowing the Ministry of Magic to, er, inspect a wizard's estate. Probably called that because it's quicker to say than "Decree for Helping Ourselves to Whatever Looks Interesting".
Decree for the Reasonable Restriction of Underage Wizardry: A law dating from 1875 which disallows student wizards from using magic outside of school.
Dedalus Diggle: Etym: Alternate spelling of Daedalus, of course.
Defense Against the Dark Arts: A required subject for all Hogwarts students, but by far the most hazardous class to teach. Teachers so far:
Harry's first year: Professor Quirrell
Second year: Gilderoy Lockhart
Third year: Remus Lupin (with a bit of substitute teaching from
Professor Snape, nearly dodging the jinx)
Fourth year: Bartemius Crouch disguised as Alastor Moody
Fifth year: Dolores Umbridge
Sixth year: Snape again, unfortunately
Seventh year: Amycus Carrow
Defensive Magical Theory (OotP ch. 9): The textbook for Defense Against the Dark Arts in Harry's fifth year.
Deflagration Deluxe (OotP ch. 28): A collection of Weasleys' Wildfire Whiz-Bangs.
Deflating Draft: The antidote to a Swelling Solution.
Defodio (DH ch. 26): An incantation for tunnel-digging.
Etym: Latin, "I dig down", "cover", "bury", "conceal". (Just plain "dig" is fodio.)
Delacour, Apolline (DH ch. 6): Fleur and Gabrielle's mother.
Etym: See below.
Delacour Weasley, Fleur Isabelle: Etym: French for "of the court". A "flower of the court" would be a particularly striking noble lady.
Delacour, Gabrielle: Fleur Delacour's little sister.
Etym: See above.
Delacour, Monsieur (DH ch. 6): Fleur and Gabrielle's unnamed father.
Delaney-Podmore, Sir Patrick (CoS ch. 8): The head of the Headless Hunt.
Etym: Delaney may be from a French root meaning "wool" or "alder grove", or the Gaelic patronymic Ó Dubhshláine, composed of the elements dubh "black" + slán "challenge, defiance".
Podmore is of uncertain origin, possibly from Middle English pod or pad "frog" + more "fen, marsh".
Deletrius: An incantation to banish a summoned creature.
Etym: An alteration of deleterious, maybe.
Deluminator (DH ch. 7): Albus Dumbledore's name for his Put-Outer. (Or possibly the proper name all along, and it got changed for the US edition.)
Etym: It's the thing which causes things to be non-luminous.
Demelza Robins: Etym: The name comes from a placename, and was popularized by a character in the Poldark series.
dementor: A corpselike, possibly undead creature that feeds on emotions, draining away a person's will to live. Usually swathed in a cloak, their faces are seen only by people about to receive a dementor's kiss. Dementors are the guards of Azkaban.
Etym: Invention from demented, as in cause to be.
dementor's kiss: How a dementor sucks out a person's soul, leaving them in a permanent vegetative state.
Demiguise (DH ch. 21): A creature whose hair can be made into an invisibility cloak, although it will eventually wear out and remain visible. For more information, see Fantastic Beasts and Where to Find Them.
Etym: Demi- (half) + guise (appearance).
de Mimsy-Porpington: see Mimsy-Porpington.
Dennis (PS ch. 3): Part of Dudley Dursley's gang.
Etym: Derived from Dionysius, though the exact etymology is uncertain. St. Denis is a patron saint of France, who according to legend was martyred by decapitation. He is portrayed in art as a headless living figure.
Dennis Bishop: Etym: See above.
Dennis Creevey: Etym: See above.
Densaugeo: Incantation for a curse that makes the target's teeth grow.
Etym: Latin dens "tooth" + augeo "I augment". To make grammatical sense, ought to be dentemaugeo ("tooth" as direct object) or densauge (imperative: "tooth, grow!").
Department for the Regulation and Control of Magical Creatures: One of the many departments of the Ministry of Magic, incorporating the Beast Division, Being Division, Spirit Division, the Goblin Liaison Office, and the Pest Advisory Bureau.
Department of International Magical Cooperation: Another department of the Ministry of Magic, responsible in part for overseeing the Quidditch World Cup and the Triwizard Tournament, and containing the International Magical Trading Standards Body, the International Magical Office of Law, and the British seats of the International Confederation of Wizards.
Department of Magical Accidents and Catastrophes (OotP ch. 7): Another arm of the Ministry of Magic which holds the Accidental Magic Reversal Squad, the headquarters for Obliviators, and the Muggle-Worthy Excuse Committee.
Department of Magical Games and Sports: Yet another tentacle of the Ministry of Magic, incorporating the British and Irish Quidditch League, the Official Gobstones Club, and, for some reason, the Ludicrous Patents Office.
Department of Magical Law Enforcement (OotP ch. 7): A piece of the Ministry of Magic which contains the Magical Law Enforcement Squad, the Improper Use of Magic Office, the headquarters for the Aurors, and the administrative services for the Wizengamot.
Department of Magical Transport (OotP ch. 7): Another name for the Department of Magical Transportation.
Department of Magical Transportation: A section of the Ministry of Magic which contains the Floo Network Authority, Broom Regulatory Control, the Portkey Office, and the Apparation Test Center.
Department of Mysteries: The research arm of the Ministry of Magic.
Deprimo (DH ch. 21): An incantation that knocks a hole in the floor.
Etym: From Latin deprimere, "press down" or "sink down".
Derek (PoA ch. 11): A Hogwarts student, two years behind Harry, house unknown.
Derrick (PoA ch. 15): A Beater on the Slytherin Quidditch team.
Etym: Related to Theoderic, "people-rule". As a common noun, from the surname of a noted hangman at Tyburn, circa 1600.
Dervish and Banges: A toy shop in Hogsmeade.
Etym: Dervish is from Arabic darwiish, meaning a member of a Sufi fraternity, and is also used in fantasy to mean a whirling supernatural being. Banges would be an alteration of bangs.
Derwent, Dilys (OotP ch. 22): An 18th century Healer at St. Mungo's Hospital, after which a stint as headmistress of Hogwarts must have seemed fairly easy.
Descendo (DH ch. 31): An incantation to make something fall down.
Etym: Latin, "I descend". I guess it's supposed to be transitive?
Detachable Cribbing Cuffs (OotP ch. 31): A banned item at O.W.L. exams.
Deverill, Barnabas (DH ch. 21): A former owner of the Elder Wand, killed by Loxias for it.
Etym: Closest I could find was Everill, which goes back to an Old English name constructed from eofor "wild boar" + hild "battle".
Devil's Snare: A magical plant which grabs hold of anyone within range. (What it plans to do with them next has not been recorded.) It recoils from bright light.
Devon: A region of the UK which is home to the Flamels.
Diagon Alley: A wizard shopping district somewhere in London, accessible from The Leaky Cauldron and the Floo Network. Establishments therein include Eeylops Owl Emporium, Flourish and Blotts, Gringotts, Madam Malkin's Robes for All Occasions, Gambol and Japes, Florean Fortescue's ice cream parlor, Magical Menagerie, Quality Quidditch Supplies, Twilfitt and Tatting, Weasley's Wizard Wheezes, and Ollivander's.
Diffindo: The incantation for the Severing Charm.
Etym: Possibly Latin, "I split, cleave". Imperative: diffindere.
Diggle, Dedalus: A wizard who, according to Professor McGonagall, "never had much sense". Harry met him at The Leaky Cauldron.
Etym: Probably from the word dighel, meaning secret or obscure, though the proper etymology of the surname is different.
Diggory, Amos (GoF ch. 6): Cedric Diggory's father. He works for the Department for the Regulation and Control of Magical Creatures.
Diggory, Cedric: A Hufflepuff, two years ahead of Harry, the captain and Seeker of the Hufflepuff Quidditch team and one of the Hogwarts champions in the Triwizard Tournament. Also a co-winner of the tournament, which inevitably leads to him being killed seconds later. Now exists as a shade. Wand: 12.25", springy, ash and unicorn hair.
Etym: Goes back to the medieval romance of Sir Degaré, and is probably from French égaré "strayed, lost".
Dijon (OotP ch. 20): A region of France that Hagrid and Maxime passed through on their way to find the giants.
dilligrout (HBP ch. 12): A password used by the Fat Lady.
Etym: An actual obsolete word; it was pottage offered to the kings of England on their coronation day.
Dillonsby, Ivor (DH ch. 2): A wizard who claims Albus Dumbledore plagiarized his dragon's blood research.
Etym: Couldn't find any.
Dilys Derwent: Etym: None found.
Dimitrov (GoF ch. 8): A Chaser on the Bulgarian national Quidditch team.
Etym: From Greek Deemeetrios "(follower) of Demeter".
Dingle, Harold (OotP ch. 31): A student who was selling fake powdered dragon claw as an exam-taking aid.
Etym: From the Middle English word for a small wooded dell or hollow.
Dippet, Armando (CoS ch. 13): The headmaster of Hogwarts in Tom Riddle's time, probably Dumbledore's immediate predecessor.
Etym: Variation of Theobald, from the Germanic personal name *þeudo "people, race" + bald "bold, brave".
Dirigible Plum (DH ch. 20): A radishlike fruit which grows above ground. The name would suggest you can make it do something.
Dirk Cresswell: Etym: A Flemish version of Derrick.
Disapparation: Apparation as seen from the point of departure.
Disarming Charm: A spell that knocks an opponent's wand out of their grip. Incantation: Expelliarmus.
Disillusion (OotP ch. 3): To cast a Disillusionment Charm on.
Disillusionment Charm (OotP ch. 3): A spell that gives the target perfect camouflage.
Dissendium: The password to open the secret passage from Hogwarts to Honeydukes.
Etym: Latin, "dissension, discord".
dittany: OED lists a number of possible plants but, for our purposes, probably Origanum dictamnus aka Dictamnus creticus, once alleged to have medicinal virtues.
Divination: An elective subject at Hogwarts, taught, in a loose sense of the word, by Professor Trelawney.
Dobbs, Emma (GoF ch. 12): A Hogwarts student three years behind Harry, house unknown.
Etym: From a variation of Robert, which comes from Old English/German hrothi "fame" + berhta "bright".
Dobby: A house-elf formerly in the employ of Lucius Malfoy, who went to Hogwarts to break new ground with the unthinkable practice of being paid to work, and later to Shell Cottage to wind up getting ground broken for him.
Etym: Word for a household sprite or apparition, particularly a brownie. See house-elf for more.
Doge, Elphias (OotP ch. 3): A member of the Order of the Phoenix.
Etym: The title of the ruler of Venice from the 8th to 18th centuries, also used as the title of a civil official for a time in Genoa.
Dolohov, Antonin (GoF ch. 30): A Death Eater, imprisoned in Azkaban, freed, and sent right back after the Death Eater raid on the Ministry of Magic.
Etym: No info on the name and the nearest Russian words don't look too likely at the moment.
Dolores Jane Umbridge: Etym: Spanish for "sorrows".
Dorcas Meadowes: Etym: A Biblical figure whose name became associated with women's associations that made clothes to give to the poor.
Doreen Figg, Arabella: Etym: Probably an Irish version of Dorothy, "gift of God".
Doris Crockford: Etym: The name of a sea nymph in Greek myth, origin unknown. Noted as a given name only as far back as 1819.
Doris Purkiss: Etym: See above.
Dorkins, Mary (OotP ch. 1): A TV news reporter.
Etym: No info on the name. Used here, the closeness to dork might be intentional.
Dot [Dorothy] (GoF ch. 1): The cook at The Hanged Man.
Etym: The name is believed to have developed from an arbitrary inversion of Theodora, Greek for "God's gift".
Downing Street (DH ch. 5): The street on which the British prime minister lives; used as shorthand for that residence.
doxy (OotP ch. 6): Small, beetle-like magical creatures with a venemous bite.
Etym: Not sure.
Doxycide (OotP ch. 6): An aerosol spray that will paralyze a doxy.
Draco Malfoy: Etym: Latin for "dragon", though the direct source for Mr. Malfoy's name is probably the Athenian ruler who gave us the word draconian.
Dragomir Gorgovitch: Etym: From Old Slavic dorogo "dear, beloved" + meri "great, famous".
dragons: Many dragon species are still found in the wild throughout Europe. All appear to be are variations on the typical European dragon, with wings and fiery breath. Specific varieties mentioned so far are the Chinese Fireball, Common Welsh Green, Hebridean Black, Hungarian Horntail, Swedish Short-Snout, and Norwegian Ridgeback.
Although captive dragon breeding is now outlawed, dragons are still useful to wizards in many ways. Their heartstrings are used in wands, their dung is used as compost for magical plants, and Albus Dumbledore alone has invented twelve uses for their blood.
When facing a dragon, it is helpful to remember that its eyes are its weakest spot.
Dragon Breeding for Pleasure and Profit: One of Hagrid's collection of dragon books.
Dragon Keeper's Guide, A: Another of Hagrid's co