• Shaped like a half moon. Semilunar bone (Anat.), a bone of thecarpus; the lunar. See Lunar, n.-- Semilunar, or Sigmoid, valves (Anat.), the valves at thebeginning of the aorta and of the pulmonary artery which prevent theblood from flowing back into the ventricle.


    Semilunar meaning & definition 1 of Semilunar.

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