The Collaborative International Dictionary
Abomasus
Abomasum \Ab`o*ma"sum\, ||Abomasus \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.
Wiktionary
abomasus
n. (alternative form of abomasum English)