Dark Mark - defensive charge - Defensive Charm - Deletrius - Defodio - Densaugeo - Deprimo - Descendo - Diffindo - Disapparate - Disarming Charm - Disillusionment Charm - Dissendium - door-opening spell - Drought Charm - Duro
no incantation needed; automatic response
A charge like that of electricity runs through the body of a wizard with this automatic defensive spell.
When Vernon Dursley tried to hold Harry around the neck, he felt a sudden charge like electricity running through Harry and he had to drop him. This appears to have been an automatic defensive response on Harry's part, since there is no indication that he intentionally cast a spell (OP1).
Dumbledore used a similar spell to make Umbridge let go of Marietta, whom she was shaking violently. This may be a different form of the spell, however, since Dumbledore used his wand to perform it (OP27).
Aside from the fact that it is a spell to defend the caster, little is known about the actual effects produced by this spell.
The Magical Law Enforcement Squad gives newly-hired Hit-Witches and Hit-Wizards training in the latest defensive charms (DP).
spell name unknown
"deleterius" L. destroy, eradicate
Erases the ghost images of spells revealed by Priori Incantato. Possibly can be used to remove other spell effects as well.
"defodio" L. dig down, hollow out
Digs through or hollows out the target.
"dens" L. tooth + "augeo" L. grow
Causes the victim's teeth to enlarge grotesquely.
spell name unknown
Etymology uncertain, but perhaps related to "primer", Eng. something used to ignite an explosive charge
Blasts a hole through the target object.
"descendo" L. descend, come down
Causes something to descend or lower itself.
"Severing Charm" (?)
"diffindo" L. cleave, open
Spell that cuts something open.
Harry used this spell to slice the cover off his own brand-new copy of Advanced Potion-Making (tapping the cover while saying the spell). He then repeated the spell for the copy of the book he had borrowed from the Potions dungeon's supply of spare textbooks (HBP11).
"dis-" opposite of, from L. "apart" + "appareo" L. to appear
Apparition (see), as seen from the place a wizard is leaving.
"disillusion" Eng. to lose faith
A charm which hides the true, magical nature of something.
Mad-Eye Moody cast a Disillusionment Charm on Harry to protect him during the trip from Privet Drive to Grimmauld Place ("I'm going to Disillusion you..."). To Harry, it felt as though someone had broken an egg on his head, like a flood of cold running down over him. When under the Charm, his body took on the appearance of whatever was behind him. He felt like a human chameleon. When Moody removed the Charm, it felt like trickling of warmth instead of cold (OP3, OP4).
Voldemort cast a Disillusionment Charm to conceal himself from anyone watching from Hogwarts Castle when he arrived to rob Albus Dumbledore's tomb; the Disillusionment Charm worked so well that even he could not see himself (DH24).
Vincent Crabbe, Gregory Goyle, and Draco Malfoy used a Disillusionment Charm to hide in the corridor outside the Room of Requirement during the Battle of Hogwarts, which is how they happened to sneak in when Harry, Ron, and Hermione arrived to search for the diadem of Ravenclaw (DH31).
spell name unknown
uncertain: "dissocio" L. to sever or divide? Possibly similar in sound to "descend."
Comments from Amanda in email:
"Dissocio" in its verb form means "to part" or "to separate". The word "en" can mean both "here!" and "look!" Dium, of course, refers to the sun and normally translates as "day" or "today" but I have seen it used as a command to mean "now." So together dissendium could mean "part/separate here, now!"
Opens the secret door in the statue of the hump-backed witch.
no incantation used
Sends a jet of sparks out of the wand, opening the target door.
Dries up water.
"duro" L. to harden, solidify
Turns the target object to stone.