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.

Nearby words

semilunar bone, semilunar cartilage, semilunar conjunctival fold, semilunar ganglion, semilunar line, semilunar valve, semimajor axis, semimatte, semimembranous, semimicroanalysis, semiminor axis

Compare aortic valve, pulmonary valve.

Origin of semilunar valve

First recorded in 1710–20

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for semilunar valve

semilunar valve

noun

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for semilunar valve

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.