Exorcise

Webster's Dictionary of the English Language

·vt To deliver or purify from the influence of an evil spirit or demon.

II. Exorcise ·vt To cast out, as a devil, evil spirits, ·etc., by conjuration or summoning by a holy name, or by certain ceremonies; to expel (a demon) or to conjure (a demon) to depart out of a person possessed by one.