semilunar valve Hear it!

semilunar valve definition

semilunar valve

either of two crescent-shaped heart valves, one, a pulmonary valve, at the junction of the right ventricle and pulmonary artery, the other, an aortic valve, at the junction of the left ventricle and aorta, which keep blood from flowing back into the ventricles

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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