单词	lunule
释义	lunule /ˈluːnjuːl / noun Another term for lunula.The hymen, which medical descriptions depict as nothing more than a lunule or crescent-shaped membrane bordering the labia minora, is among the most meaningful of body parts.... Notches (‘open’ lunules) are ambulacral lunules that form close enough to the ambitus that the ambitus is unable to close over the distal part of the notch to form a closed lunule. Other falcate mylilids like Lycettia, Coxesia and Falcimytilus all lack radial or divaricating or half-divaricating surface sculpture and have a more truncated anterior shell flank with a well-defined lunule.
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