What does "lunule" mean?

Lunule: (Chem.) A lune. See Lune.

Additional senses

  1. 2.(Zoöl.) (a) A small or narrow crescent. (b) 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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