abomasum
Concise Oxford English Dictionary © 2008 Oxford University Press:
abomasum /ˌabəʊˈmeɪsəm/
▶noun (pl. abomasa /-sə/) Zoology the fourth stomach of a ruminant, which receives food from the omasum and passes it to the small intestine.
'abomasum' also found in these Oxford entries:

