| 单词 | semilunar valve |
| 释义 | semilunar valve Anat. either of two valves, one in the aorta and one in the pulmonary artery, consisting of a set of three crescent-shaped flaps of tissue and serving to prevent blood from flowing back into the heart after contraction. Cf. aortic valve, pulmonary valve. [1710-20] |
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