somnific

[ som-nif-ik, suhm- ]
/ sɒmˈnɪf ɪk, səm- /

adjective

causing sleep; soporific; somniferous.

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Origin of somnific

1715–25; <Latin somnificus causing sleep, equivalent to somni-, combining form of somnus sleep + -ficus-fic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020