1. 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]
WordNet (r) 3.0 (2006):
first stomach
n 1: 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]