Ex ‧ or ‧ cist, The /ˈeksɔːsəst, ˈeksɔːsɪst $ -ɔːr-/ BrE AmE
(1973) a US ↑ horror film (=a film that is intended to make you feel frightened) about a young girl who behaves very strangely and kills several people because the ↑ devil has taken control of her body. It is especially famous for the scene in which the girl's head spins around very fast, and another in which a lot of green ↑ vomit comes out of her mouth.