noun
the fourth stomach of a ruminant animal, such as a cow or sheep, where food is partially digested before passing into the small intestine
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The abomasum is the fourth compartment of the stomach in ruminant animals.
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The vet said that the cow's abomasum was causing digestive issues.
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I heard that the farmer had to get surgery on his cow's belly due to abomasum problems.
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Her kindness was like a warm abomasum, comforting everyone around her.