'Rumen' definitions:

Definition of 'rumen'

From: WordNet
noun
The first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing [syn: rumen, first stomach]

Definition of 'Rumen'

From: GCIDE
  • Rumen \Ru"men\, n. [L. rumen, - inis, the throat.]
  • 1. (Anat.) The first stomach of ruminants; the paunch; the fardingbag. See Illust. below. [1913 Webster]
  • 2. The cud of a ruminant. [1913 Webster]