2 definitions found From WordNet (r) 2.0 [wn]: abomasum noun: the fourth compartment of the stomach of a ruminant; the one where digestion takes place [syn: {fourth stomach}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Abomasum \Ab'o*ma"sum\, ||Abomasus \Ab'o*ma"sus\, noun [NL., fr. L. ab + omasum (a Celtic word).] (Anat.) The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See {Ruminantia}.

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