'exorcist' originates from Late Latin, specifically the word 'exorcista', which was formed from the verb 'exorcizare' (to drive out by prayer), itself from Greek roots.

'exorcist' changed from the Medieval Latin/ Late Latin word 'exorcista' (and Old French 'exorciste') and eventually became the modern English word 'exorcist' through Middle English usage.

Initially related to rites or formulas that 'bind by oath' or 'set a curse against' (from Greek roots), but over time it evolved into the current meaning of 'a person who expels evil spirits.'