omasum
noun
oma·sum ō-ˈmā-səm 
plural omasa ō-ˈmā-sə
: the third chamber of the ruminant stomach that is situated between the reticulum and the abomasum compare rumen
Word History
Etymology
borrowed from New Latin omāsum, going back to Latin, "oxʼs tripe," of obscure origin
First Known Use
1556, in the meaning defined above
Medical Definition
omasum
noun
oma·sum ō-ˈmā-səm
plural omasa -sə
: the third chamber of the ruminant stomach that is situated between the reticulum and the abomasum
called also manyplies, psalterium
compare rumen