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.
Compare aortic valve, pulmonary valve.

Origin of semilunar valve

First recorded in 1710–20

Words nearby semilunar valve

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

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

Medical 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.