Sop′o‐rif″er‐ous (?), a. [L. soparifer; sopor a heavy sleep + ferere to bring.] Causing sleep; somniferous; soporific. “Soporiferous medicine.” Swift.
— Sop′o‐rif″er‐ous‐ly, adv. — Sop′o‐rif″er‐ous‐ness, n.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.