{ ‖Ab′o‐ma″sum (�), ‖Ab′o‐ma″sus (�), } n. [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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.