noun
semilunar valve
Anatomical term for the crescent-shaped valves in the heart (aortic and pulmonary) or sometimes in veins.
大動脈弁と肺動脈弁は半月弁と呼ばれる。
The aortic valve and the pulmonary valve are called semilunar valves.
三尖弁 is the tricuspid valve, another atrioventricular valve, distinct from the semilunar valves.
Compound of 半月 (はんげつ, 'half-moon') and 弁 (べん, 'valve'), referring to the crescent shape of these heart valves.