meaning of lunule
1. Anything crescent-shaped; a crescent-shaped part or mark; a lunula, a lune.
2. A lune. See Lune.
3. A small or narrow crescent.
4. A special area in front of the beak of many bivalve shells. It sometimes has the shape of a double crescent, but is oftener heart-shaped. See Illust. of Bivalve.
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