Sop′o‐rif″ic (?; 277), a. [L. sopor a heavy sleep (akin to somnus sleep) + facere to make. See Somnolent, Fact.] Causing sleep; tending to cause sleep; soporiferous; as, the soporific virtues of opium.
Syn. — Somniferous; narcotic; opiate; anodyne.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.