rumen
ru.men \'ru:-m*n\ \-m*-n*\ \-m*n-*l\ n or ru.mi.na or rumens [NL, fr. L, gullet] pl : the large first compartment of the stomach of a ruminant in which cellul ose is broken down by the action of symbionts - ru.mi.nal aj
Webster's English Dictionaryru.men \'ru:-m*n\ \-m*-n*\ \-m*n-*l\ n or ru.mi.na or rumens [NL, fr. L, gullet] pl : the large first compartment of the stomach of a ruminant in which cellul ose is broken down by the action of symbionts - ru.mi.nal aj