Medical Definition of mesentery
1: one or more vertebrate membranes that consist of a double fold of the peritoneum and invest the intestines and their appendages and connect them with the dorsal wall of the abdominal cavity; specifically : such membranes connected with the jejunum and ileum in humans
2: a fold of membrane comparable to a mesentery and supporting a viscus (as the heart) that is not a part of the digestive tract
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