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Definition of rumen : 1. The cud of a ruminant.
2. The first stomach of ruminants; the paunch; the fardingbag. See Illust. below.

Synonyms:

first stomach

Usage examples:

• The opening is increased in size until the operator's hand can be inserted into the rumen. - "Special Report on Diseases of Cattle", U.S. Department of Agriculture J.R. Mohler.
• Sometimes this accident is complicated by a rupture of the rumen, constituting a complicated hernia. - "Special Report on Diseases of Cattle", U.S. Department of Agriculture J.R. Mohler.
• It is then carried back to the mouth, remasticated and returned to the rumen. - "Common Diseases of Farm Animals", R. A. Craig, D. V. M..