any of the crescent-shaped pocket-like flaps that occur in two sets of three to form the aortic or pulmonary valves that prevent blood flowing backward into the heart
| 单词 | semilunar valve |
| 释义 | semilunar valvenounany of the crescent-shaped pocket-like flaps that occur in two sets of three to form the aortic or pulmonary valves that prevent blood flowing backward into the heart |
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