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Webster 1913 Edition
Abomasus
{ ‖
Abˊo-ma′sum
, ‖Abˊo-ma′sus
, }Noun.
 [NL., fr. L. 
ab 
+ omasum 
(a Celtic word).] (Anat.) 
The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See 
Ruminantia
.