P

Patronus Charm - Pepper Breath - Peskipiksi Pesternomi
Petrification - Petrificus Totalus - Prior Incantato

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Patronus Charm (pa-TROH-nus)

"patronus" Medieval L. patron saint.

See EXPECTO PATRONUM

Pepper Breath

no incantation given

This charm gives a person firey hot breath.

• Harry, when researching spells to use against a dragon, decides against this one (GF20).

Peskipiksi Pesternomi (pes-kee PIK-see  pes-ter-NO-mee)
"Freezing Charm"?

"pesky" + "pixie" + "pester" + "no" + "me"

Lockhart's version of a Freezing Charm.

• Lockhart tries this spell on the escaped Cornish Pixies. It has no effect. The spell words certainly don't fit the usual format, so it seems likely that Lockhart was making the whole thing up on the spot. (CS6) 

Petrification

"petrificare" L. to make into stone, from "petra" L. rock

Not a spell so much as a magical effect, caused by seeing the reflected eyes of a Basilisk.

• The Petrification effect resembles death, except that the victim is still alive, as if in suspended animation. It takes careful examination to discern whether a victim is in fact Petrified instead of dead. If a ghost is Petrified, is turns a dark smokey gray and can only be moved by the use of a fan. The antidote is made from mandrake roots (CS9).

Petrificus Totalus (pe-TRI-fi-cus  toe-TAH-lus)
"Full Body Bind"

"petrificare" L. to  make into stone + "totalis" L. entire

Turns the entire body of the victim rigid.

• Hermione casts this spell on Neville with profuse apologies when he tried to stop them from going after the Sorcerer's Stone (SS16)

Prior Incantato (prye-OR  in-can-TAH-toe)
also: Priori Incantatem
"Reverse Spell Effect"

"prior" L. former, earlier, preceeding + "incantatare" L. to bewirtch or enchant

Can be cast as a spell, ("Prior Incantato"), in which case it forces a wand to emit a ghost image of the last spell it cast. The images can be dispelled using the Deletrius spell. 

When two wands are forced to duel which have core material from the same single animal, the result will be "Priori Incantatem," a display in sequence of the last spells one of the wands cast. Which wand will show the spell effect depends on the willpower of the two wizards involved.

• Amos Diggory cast the Prior Incantato spell on Harry's wand to find out if it had cast the Dark Mark (GF9) 
• When Harry and Voldemort dueled, their wands, which share a core of a feather from the same phoenix, were linked in the Priori Incantatem effect. (GF36)