Lunule

·noun A small or narrow crescent.

II. Lunule ·noun A lune. ·see Lune.

III. Lunule ·noun Anything crescent-shaped; a crescent-shaped part or mark; a lunula, a lune.

IV. Lunule ·noun 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.