Etymology
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mesentery (n.)

"a fold of the peritoneum," early 15c., mesenterie, from medical Latin mesenterium "middle of the intestine," from medical Greek mesenterion, literally "the middle intestine," from mesos "middle" (from PIE root *medhyo- "middle") + enteron "intestine" (from PIE *enter-, comparative of root *en "in"). Related: Mesenteric.

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Definitions of mesentery

mesentery (n.)
a double layer of peritoneum that attaches to the back wall of the abdominal cavity and supports the small intestines;
From wordnet.princeton.edu