semilunar-valve

semilunar valve

noun Anatomy.
either of two valves, one in the aorta and one in the pulmonary artery, consisting of a set of three crescent-shaped flaps of tissue and serving to prevent blood from flowing back into the heart after contraction.


Origin:
1710–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
semilunar valve
 
n
anatomy either of two crescent-shaped valves, one in the aorta and one in the pulmonary artery, that prevent regurgitation of blood into the heart

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

semilunar valve n.
One of three semilunar segments serving as the cusps of a valve preventing regurgitation, as in the aortic valve and the pulmonary valve.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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