Breadcrumb Home > Dictionary > Index A Cite abomasum: Meaning and Definition of Find definitions for: ab•o•ma•sum Pronunciation: (ab"u-mā'sum), [key] — pl. -sa the fourth or true stomach of cud-chewing animals, lying next to the omasum. See diag. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: abomasum (Thesaurus) abolla abomasus TrendingHere are the facts and trivia that people are buzzing about. April 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress Noble Titles and Ranks in a Monarchy Keeping Your Brain Active in a COVID-19 World Quetzalcoatl: Aztec Myths and Myths About the Aztecs Related Content Daily Word Quiz: risible Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language