OPIATE

opiate. Opiate, n. a medicine causing sleep; a. causing sleep

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O″pi‐ate (?), n. [[From Opium: cf. F. opiat.]] 1. 1. Originally, a medicine of a thicker consistence than sirup, prepared with opium. Parr.
2. 2. Any medicine that contains opium, and has the quality of inducing sleep or repose; a narcotic.
3. 3. Anything which induces rest or inaction; that which quiets uneasiness.
They chose atheism as an opiate. Bentley.