• synonyms


  1. a combining form meaning “sleep”, used in the formation of compound words: somnifacient.
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Also especially before a vowel, somn-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for somn

Historical Examples of somn

  • The variations of this doctrine are set forth in detail by Macrobius, In Somn.

    The Oriental Religions in Roman Paganism

    Franz Cumont

  • Nor is this a singular opinion, but it hath had many learned patrons, such was Macrobius, Somn.

British Dictionary definitions for somn


before a vowel somn-

combining form
  1. sleepsomniferous
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Word Origin for somni-

from Latin somnus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for somn


before vowels somn-, word-forming element meaning "sleep," from comb. form of Latin somnus (see Somnus).

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Online Etymology Dictionary, © 2010 Douglas Harper

somn in Medicine


  1. Sleep:somnambulism.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.