n :  a surgical bypass operation performed to shunt blood around an obstruction in a coronary artery that usu. involves grafting one end of a segment of vein (as of the saphenous vein) removed from another part of the body into the aorta and the other end into the coronary artery beyond the obstructed area to allow for increased blood flow - called also coronary artery bypass  .
 
 
 
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