ru·men /ˈrumən/
  瘤胃,反芻
  ru·men /ˈrumən/ 名詞
  瘤胃
  Ru·men n.
  1. Anat. The first stomach of ruminants; the paunch; the fardingbag. See Illust. below.
  2. The cud of a ruminant.
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  rumen
       n : the first compartment of the stomach of a ruminant; here
           food is collected and returned to the mouth as cud for
           chewing [syn: first stomach]
       [also: rumina (pl)]