the GNU version of the Collaborative International Dictionary of English
n. The third division of the stomach of ruminants. See manyplies, and Illust. under ruminant.
The Century Dictionary and Cyclopedia
n. The third stomach of a ruminant; the psalterium or manyplies. See abomasum.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the third compartment of the stomach of a ruminant
Word Usage
"Ā The third stomach is called the omasum, which means book, and though I could see how someone looking might see pages, for me, the deep longitudinal folds of this stomach were drapes made of terrycloth."