Type: Charm
Pronunciation: ex-PELL-ee-ARE-muss
Description: Forces whatever an opponent is holding to fly out of their hand. Harry Potter's signature spell.
Seen/Mentioned: Used multiple times from the second book onwards.
Etymology: Probably a combination of Latin expello, meaning "expel", and arma, meaning "weapon".
Notes: Mentioned in Doctor Who starring David Tennant and Freema Agyeman, second episode of third series. It was also used differently in the Prisoner of Askaban PS2 video game, in which a pink coloured shield is formed to protect against jinxes.