D defs.my
Entry 2 senses Webster, 1913

Rumen

/ro͞om'-ən/ · Ru·men · IPA /ˈɹu.mən/
01 n. The first stomach of ruminants; the paunch; the fardingbag. See Illust. below.
  1. 1.
    The first stomach of ruminants; the paunch; the fardingbag. See Illust. below. <-- ! PCP -->(Anat.)
  2. 2.
    The cud of a ruminant.