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somnific

[som-nif-ik, suh m-]
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adjective
  1. causing sleep; soporific; somniferous.

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. 2018
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