rumen

The first division of the stomach of a ruminant animal, in which most food collects immediately after being swallowed and from which it is later returned to the mouth as cud for thorough chewing.

The cud of a ruminant.

The paunch or first stomach of a ruminant; the largest of the four compartments of the ruminant stomach.

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

The cud of a ruminant.

The first stomach of ruminants

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