Available Definitions:
1) n. - Anything crescent-shaped; a crescent-shaped part or mark; a lunula, a lune.
2) n. - A lune. See Lune .
3) n. - A small or narrow crescent.
4) n. - 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.