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valves |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Semilunar \Sem`i*lu"nar\, a. Shaped like a half moon. {Semilunar bone} (Anat.), a bone of the carpus; the lunar. See {Lunar}, n. {Semilunar}, 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.
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