A person, usually religious, who performs ceremonies to try to remove evil spirits or demons from a person or place.
From Late Latin 'exorcista,' from Greek 'exorkizein' meaning to bind by oath or to drive out by adjuration. From 'ex-' (out) and 'horkos' (oath/spell).
An exorcist uses words and oaths to 'drive out' spirits—the word literally means 'one who swears out' or binds with oaths—so the power is supposed to come from the magic of words themselves!
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