ab·oma·sum /ˌæboˈmesəm/
  [反芻動物] 第四胃;皺胃
  ab·oma·sum /ˌæboˈmesəm/ 名詞
  皺胃
  Ab·o·ma·sum Ab·o·ma·sus n.  Anat. The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See Ruminantia.
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  abomasum
       n : the fourth compartment of the stomach of a ruminant; the one
           where digestion takes place [syn: fourth stomach]