Rumen

[ru:men]

(noun.) the first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing.

Checker: Seymour--From WordNet

(n.) The first stomach of ruminants; the paunch; the fardingbag. See Illust. below.

(n.) The cud of a ruminant.

Editor: Mervin

n. the paunch and first stomach of a ruminant:—pl. Ru′mina.

Editor: Michel