DICT.TW Dictionary Taiwan

 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 flexure Anat., the last curve of the colon before it terminates in the rectum. See Illust. under Digestive.
 Sigmoid valves. Anat. See Semilunar valves, under Semilunar.
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