Search Result for "semilunar valve":
Wordnet 3.0

NOUN (1)

1. a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart; 



WordNet (r) 3.0 (2006):

semilunar valve
    n 1: a heart valve with cusps shaped like half-moons; prevents
         blood from flowing back into the heart