• synonyms


[oh-mey-suh m]
noun, plural o·ma·sa [oh-mey-suh] /oʊˈmeɪ sə/,
  1. the third stomach of a ruminant, between the reticulum and the abomasum; the manyplies.
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Origin of omasum

1700–10; < New Latin, Latin omāsum bullock's tripe
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for omasum

Historical Examples of omasum

  • Aboma′sum, or Aboma′sus, the fourth stomach of ruminating animals, next the omasum or third stomach.

    The New Gresham Encyclopedia. Vol. 1 Part 1


British Dictionary definitions for omasum


noun plural -sa (-sə)
  1. another name for psalterium
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Word Origin for omasum

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

omasum in Science


Plural omasa
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.