semilunar valve

noun

, Anatomy.

1. 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.

semilunar valve

noun

1. 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

Word History and Origins

Origin of semilunar valve¹

First recorded in 1710–20

Example Sentences

The nostrils are two semilunar valve-like slits at the apex of the muzzle.

From Project Gutenberg