• synonyms


[ab-uh-mey-suh m]
noun, plural ab·o·ma·sa [ab-uh-mey-suh] /ˌæb əˈmeɪ sə/.
  1. the fourth or true stomach of cud-chewing animals, lying next to the omasum.
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Origin of abomasum

From New Latin, dating back to 1700–10; see origin at ab-, omasum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for abomasum

Historical Examples

  • Finally there is the abomasum, out of which proceeds the small intestine.

    The Cambridge Natural History, Vol X., Mammalia

    Frank Evers Beddard

  • Most, however, have four, the leaf stomach or psalterium being intercalated between the retinaculum and the abomasum.

  • These are called the paunch, the honeycomb stomach or bag, the manyplies and the abomasum.

British Dictionary definitions for abomasum


  1. the fourth and last compartment of the stomach of ruminants, which receives and digests food from the psalterium and passes it on to the small intestine
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Word Origin

C18: New Latin, from ab- 1 + omāsum 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

abomasum in Science


Plural abomasa
  1. The fourth division of the stomach in ruminant animals, and the only one having glands that secrete acids and enzymes for digestion. It corresponds anatomically to the stomachs of other mammals. 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.