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n 1 a  :  a saclike expansion of the alimentary canal of a vertebrate communicating anteriorly with the esophagus and posteriorly with the duodenum and being typically a simple often curved sac with an outer serous coat, a strong complex muscular wall that contracts rhythmically, and a mucous lining membrane that contains gastric glands  b  :  one of the compartments of a ruminant stomach <the abomasum is the fourth of a ruminant>   2  :  a cavity in an invertebrate animal that is analogous to a stomach  3  :  the part of the body that contains the stomach  :  BELLY, ABDOMEN .

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