(from the article `human cardiovascular system`) The semilunar valves are pocketlike structures attached at the point at which the pulmonary artery and the aorta leave the ventricles. The pulmonary ... ...of the heart is the tricuspid valve, composed of three flaps of tissue; on the left is the two-piece mitral valve. Once blood has lef...
<anatomy, cardiology> Refers to a type of valve, aortic or pulmonic valves. ... (27 Sep 1997) ... 
Type: Term Definitions: 1. a heart valve composed of a set of three semilunar cusps (valvules); hence both the aortic and pulmonary valves are semilunar valves. Synonyms: valvula semilunaris
(sem;e-loo;nar) Crescent- or half-moon-shaped heart valves positioned at the entrances to the aorta and the pulmonary trunk.
[n] - a heart valve with half-moon-shaped cusps
noun a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart