n. 瘤胃

[医] 瘤胃(反刍动物的第一胃)

[ noun ]
the first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing
<noun.animal>

Rumen \Ru"men\, n. [L. rumen, - inis, the throat.]
1. (Anat.) The first stomach of ruminants; the paunch; the
fardingbag. See Illust. below.

2. The cud of a ruminant.