- The definition of a semilunar valve is either the pulmonary valve or the aorta valve.
An example of a semilunar valve is one of the crescent-shaped heart valves that keep blood from flowing back into the ventricles.
semilunar valve definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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
semilunar valve definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Either of two valves, one located at the opening of the aorta and the other at the opening of the pulmonary artery, each consisting of three crescent-shaped cusps and serving to prevent blood from flowing back into the ventricles.
semilunar valve - Medical Definition
One of three semilunar segments serving as the cusps of a valve preventing regurgitation, as in the aortic valve and the pulmonary valve.