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A gastrojejunostomy is a surgical procedure that directly connects the stomach to the jejunum, the second section of the small intestine, by a small tube. The tube allows food, liquids, and medications to bypass the duodenum, the first section of the small intestine.
Definition of gastric bypass. : a surgical bypass operation that typically involves reducing the size of the stomach and reconnecting the smaller stomach to bypass the first portion of the small intestine so as to restrict food intake and reduce caloric absorption in cases of severe obesity â compare gastric banding.