Medical Definition of bypass
: a surgically established shunt <cardiopulmonary bypass of blood from the right atrium to the aorta>; also : a surgical procedure for the establishment of a shunt ◆When a bypass is performed on more than one coronary artery or branch, the number of times (double, triple, etc.) is often specified. <I was immediately scheduled for a triple bypass, but they decided to try an angioplasty.—Terry Todd, Sports Illustrated, 1 Aug. 1983>—see coronary bypass, gastric bypass, jejunoileal bypass
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