Found 2 items, similar to semilunar valves.
English → English (WordNet) Definition: semilunar valve semilunar valve n : a heart valve with half-moon-shaped cusps; prevents blood from flowing back into the heart
English → English (gcide) Definition: Semilunar valves Semilunar \Sem`i*lu"nar\, a. Shaped like a half moon. [1913 Webster] Semilunar bone (Anat.), a bone of the carpus; the lunar. See Lunar, n. Semilunar valves, or Sigmoid valves (Anat.), the valves at the beginning of the aorta and of the pulmonary artery which prevent the blood from flowing back into the ventricle. [1913 Webster]