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Dark Mark
Morsmordre
morz-MOR-druh
Conjures the Dark Mark, a glowing green skull with a snake coming out of its mouth. The Dark Mark is Voldemort's sign, and is usually conjured (by Death Eaters or Voldemort) above an area where Voldemort or his Death Eaters have killed.

Deletrius
deh-LEE-tree-us
Erases the "ghosts" summoned by Priori Incantatem.

Densaugeo
den-saw-OO-gee-o
Enlarges the subject's teeth.

Diffindo
dih-FIHN-do
Cuts the subject open.

Disarming Charm
Expelliarmus
ex-pel-ee-OHR-mus
Disarms subject if he/she is holding something; if not, throws him or her backwards.

Disillusionment Charm
Hides the true magical nature of something.

Dissendium
dihs-EN-dee-um
Opens the subject.

Drought Charm
Dries up water.