o·ma·sum ( -m  s m)n. pl. o·ma·sa (-s ) The third division of the stomach of a ruminant animal, located between the abomasum and the reticulum. Also called manyplies. [Latin om sum, bullock's tripe, probably of Celtic origin.] |
| omasum (-msm) Plural omasa The third division of the stomach in ruminant animals. It removes excess water from food and further reduces the size of food particles before passing them to the abomasum for digestion by enzymes. See more at ruminant. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  omasum - the third compartment of the stomach of a ruminantruminant - any of various cud-chewing hoofed mammals having a stomach divided into four (occasionally three) compartments stomach, tum, tummy, breadbasket - an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion |
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