coronary artery bypass graft

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A surgical procedure in which a section of a vein is grafted between the aorta and a coronary artery below the level of an obstruction in that artery.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun open-heart surgery in which the rib cage is opened and a section of a blood vessel is grafted from the aorta to the coronary artery to bypass the blocked section of the coronary artery and improve the blood supply to the heart