Sem·i·lu·nar a. Shaped like a half moon.
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.
Sig·moid Sig·moid·al a. Curved in two directions, like the letter S, or the Greek
Sigmoid valves. Anat. See Semilunar valves, under Semilunar.
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