WordNet
n. a semilunar valve between the left ventricle and the aorta; prevents blood from flowing from the aorta back into the heart
Wikipedia
The aortic valve is a valve in the human heart between the left ventricle and the aorta. It is one of the two semilunar valves of the heart, the other being the pulmonary valve. The heart has four valves and the other two are the mitral and the tricuspid valves. The aortic valve normally has three cusps or leaflets, although in 1–2% of the population it is found to congenitally have two leaflets. It lies between the left ventricle and the aorta.
Usage examples of "aortic valve".
How reassuring it was, after so many hands-off months of shrinking, to noodle around in bodies, palpating a belly, percussing a spleen, auscultating a heart, the sounds calling up the anatomy--that squeak a tight aortic valve, that train rumble a leaky mitral.
Bobby fired the shotgun into a nearby mound of sand, startling me so much that I nearly blew an aortic valve.