名詞 rumen:

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

ru.men

n.（名詞）
【復(fù)數(shù)】 ru.mi.na[-m…-n…] 或 ru.mens
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.Also called paunch
瘤胃：反芻動物的第一胃，食物被吞下后大多數(shù)立即在此聚集，由此返回到口中，作為反芻食物來細細咀嚼也作 paunch

來源：
Latin rômen [throat]
拉丁語 rômen [喉嚨，嗓子]

【引伸】
ru.minal
adj.（形容詞）