somni

somni-

a combining form meaning “sleep”, used in the formation of compound words: somnifacient.
Also, especially before a vowel, somn-.
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Collins
World English Dictionary
somni- or (before a vowel) somn-
 
combining form
sleep: somniferous
 
[from Latin somnus]
 
somn- or (before a vowel) somn-
 
combining form
 
[from Latin somnus]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

somni- or somn-
pref.
Sleep: somnambulism.

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