Serving to exorcise; having the function or effect of driving out evil spirits or demons.
From exorcise plus the adjectival suffix -ory (from Latin -orius), which creates adjectives meaning 'relating to' or 'serving to.' The suffix -ory often describes things that perform a function or purpose.
The suffix -ory is less common than -al in modern English, but it specifically emphasizes function or purpose—'exorcisory' doesn't just describe something as relating to exorcism, but as actively serving the purpose of exorcizing, which is a subtle but important distinction!
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