Dictionary

semilunar valve

noun

Definition of SEMILUNAR VALVE

:  any of the crescent-shaped cusps that occur as a set of three between the heart and the aorta and another of three between the heart and the pulmonary artery, are forced apart by pressure in the ventricles during systole and pushed together by pressure in the arteries during diastole, and prevent regurgitation of blood into the ventricles; also :  either set of three cusps
ADVERTISEMENT

First Known Use of SEMILUNAR VALVE

circa 1719
Medical Dictionary

semilunar valve

noun

Medical Definition of SEMILUNAR VALVE

1
:  either of two valves of which one is situated at the opening between the heart and the aorta and the other at the opening between the heart and the pulmonary artery, which prevent regurgitation of blood into the ventricles, and each of which is made up of three crescent-shaped cusps that are forced apart by pressure in the ventricles exerted during systole and are pushed together by pressure in the arteries exerted during diastole

Browse

Next Word in the Dictionary: semilunePrevious Word in the Dictionary: semilunar lobeAll Words Near: semilunar valve
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears