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n. pl. ab·o·ma·sa (-sə)
The fourth division of the stomach in ruminant animals, such as cows, sheep, and deer, in which digestion takes place.

[New Latin abomāsum : Latin ab-, ab- + Latin omāsum, tripe; see omasum.]

ab′o·ma′sal (-səl) adj.


(ˌæbəˈmeɪsəm) or


n, pl -sa (-sə) or -si (-saɪ)
(Zoology) the fourth and last compartment of the stomach of ruminants, which receives and digests food from the psalterium and passes it on to the small intestine
[C18: New Latin, from ab-1 + omāsum bullock's tripe]


(ˌæb əˈmeɪ səm)

n., pl. -sa (-sə).
the fourth or true stomach of the cow and other ruminants, from which partially fermented and digested food is passed to the small intestine.
[1700–10; < New Latin; see ab-, omasum]


The fourth division of the stomach in ruminant animals, and the only one having glands that secrete acids and enzymes for digestion. It corresponds anatomically to the stomachs of other mammals. See more at ruminant.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.abomasum - the fourth compartment of the stomach of a ruminantabomasum - the fourth compartment of the stomach of a ruminant; the one where digestion takes place
ruminant - 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
References in periodicals archive ?
240 Haemonchus adult worms were obtained from the 9 cattle and 3 buffalo abomasa directly after the slaughter at six different locations (Lahore, Faisalabad, Sargodha, Sahiwal, Okara and Gujranwala) for experiments of Punjab province, where we anticipated a high Haemonchus prevalence.
Livers, abomasa, and small intestines were individually identified and sent to Gribbles Palmerston North Laboratory.
After opening the abdominal cavity, abomasa were removed and opened along its greater curvature.