Tiscali - Harry Potter and the Chamber of Secrets

Daily Prophet, the: The national wizarding newspaper.

Dark Mark, the: Sign of the Death Eaters: a skull with a serpent in its mouth.

Davies, Roger: Captain of the Ravenclaw Quidditch team.

Deathday Party: Celebration held by the ghosts at Hogwarts to commemorate the day they died.

Defence Against the Dark Arts : Magic lessons at Hogwarts that teach students how to defend themselves against evil creatures such as werewolves and vampires.

Deflating Draft: Potion that counteracts a swelling solution. Causes swelled body parts to return to normal size.

Death Eaters: The followers of Voldemort. They were summoned by the Dark Mark.

Delacour, Fleur: Pupil at Beauxbatons. Beautiful, with long, silvery blonde hair; her grandmother was a Veela.

Delacour, Gabrielle: Younger sister of Fleur.

Delaney-Podmore, Patrick: Leader of the Headless Hunt.

Dementor: Creature who feeds on the happy emotions of humans. Dementors are employed as guards at Azkaban. The kiss of a Dementor will suck out a human's soul, leaving an emotionless shell.

Deletrius: Spell to make something disintegrate.

Dervish and Banges: Wizarding equipment shop in Hogsmeade.

Densaugeo: Spell causing teeth to grow.

Diagon Alley: A long cobbled street filled with the most fascinating wizarding shops in the world. Accessible through the Leaky Cauldron pub in London.

Diffindo: Spell to make something split.

Diggle, Dedalus: Wizard Harry met in the Leaky Cauldron. He also once bowed to Harry in a shop.

Diggory, Amos: Father of Cedric. He is tall and has a brown beard.

Diggory, Cedric: Seeker of the Hufflepuff Quidditch team.

Disapparate: To disappear at will.

Dissendium: Spell that opens entrance to secret passage to Hogsmeade.

Divination: Magical art of telling the future using tea-leaves, crystal balls and so forth. Professor Trelawny is Divination teacher at Hogwarts.

Dobby: Name of a House-Elf who idolises Harry but gets him into lots of trouble.

Dr Filibuster's Fabulous No-Heat-Wet-Start Fireworks: Wizarding fireworks and one of Fred and George Weasley's favourite jokes. They fill the room with red and gold stars that last for about half an hour.

Draco Dormiens Nunquam Titillandus: The Hogwarts motto. It means "Never tickle a sleeping dragon."

Dragon: Mythical reptilian creature who can fly and breathe fire. Hagrid is particularly fond of dragons and has a Norwegian Ridgeback called Norbert for a while.

Draught of Living Death, the: Powerful sleeping draught.

Drooble's Best Blowing Gum: Wizarding sweet. Fills the room with blue bubbles that last for about half an hour.

Duelling Club: Club started by Professor Lockhart to teach students how to duel with spells.

Dungbomb: Stinkbomb

Dumbledore, Albus: Headmaster of Hogwarts. Dumbledore is widely regarded as the finest wizard of his generation and was the only person that Voldemort was frightened of. He is tall, thin and very old and has very long, silver hair and beard. He has blue eyes and wears half-moon spectacles and a long, purple cloak that sweeps to the ground. Dumbledore was an old English word for bumblebee.

Durmstrang Institute: School of witchcraft and wizardry somewhere in the far north of Europe. It is smaller than Hogwarts but has more extensive grounds.