gastric bypass n a surgical bypass operation performed to restrict food intake and reduce absorption of calories and nutrients in the treatment of severe obesity that typically involves reducing the size of the stomach and reconnecting the smaller stomach to bypass the first portion of the small intestine esp roux-en-y gastric bypass
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a surgical treatment for morbid obesity consisting of gastrojejunostomy with partitioning of the stomach high on its body and joining of the proximal remnant to a loop of jejunum in end-to-side anastomosis.Medical dictionary. 2011.