abomasum
noun
ab·oma·sum ˌa-bō-ˈmā-səm 
plural abomasa ˌa-bō-ˈmā-sə
: the fourth compartment of the ruminant stomach that follows the omasum and has a true digestive function compare rumen, reticulum
abomasal
ˌa-bō-ˈmā-səl
adjective 
Word History
Etymology
borrowed from New Latin abomāsum, from ab- ab- + omāsum omasum
First Known Use
1678, in the meaning defined above
Medical Definition
abomasum
noun
ab·oma·sum ˌab-ō-ˈmā-səm
plural abomasa -sə
: the fourth compartment of the ruminant stomach that follows the omasum and has a true digestive function compare rumen, reticulum