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somnific

[som-nif-ik, suh m-] /sɒmˈnɪf ɪk, səm-/
adjective
1.
causing sleep; soporific; somniferous.
Origin
1715-1725
1715-25; < Latin somnificus causing sleep, equivalent to somni-, combining form of somnus sleep + -ficus -fic
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for somnific

somniferous

/sɒmˈnɪfərəs/
adjective
1.
(rare) tending to induce sleep
Derived Forms
somniferously, adverb
Word Origin
C17: from Latin somnifer (from somnus sleep + ferre to do) + -ous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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