abomasum

ab·o·ma·sum Audio Help (āb'ō-mā'səm)

n. pl. ab·o·ma·sa (-sə)
The fourth division of the stomach in ruminant animals, such as cows, sheep, and deer, in which digestion takes place.
ab'o·ma'sal (-səl) adj.

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The American Heritage® Dictionary of the English Language, Fourth Edition
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