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[oh-mey-suh m] /oʊˈmeɪ səm/
noun, plural omasa
[oh-mey-suh] /oʊˈmeɪ sə/ (Show IPA)
the third stomach of a ruminant, between the reticulum and the abomasum; the manyplies.
Origin of omasum
1700-10; < New Latin, Latin omāsum bullock's tripe Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for omasum


noun (pl) -sa (-sə)
another name for psalterium
Word Origin
C18: from Latin: bullock's tripe
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
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omasum in Science
Plural omasa
The third division of the stomach in ruminant animals. It removes excess water from food and further reduces the size of food particles before passing them to the abomasum for digestion by enzymes. See more at ruminant.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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