LUNULE
lunula, half-moon, lunule
(noun) the crescent-shaped area at the base of the human fingernail
Source: WordNet® 3.1
Etymology
Noun
lunule (plural lunules)
Anything crescent-shaped; a crescent-shaped part or mark; a lunula or lune.
A special area in front of the beak of many bivalve shells, sometimes shaped like a double crescent, but more often heart-shaped.
Source: Wiktionary
Lu"nule, n. Etym: [F., fr. L. lunula, dim. of luna moon.]
1. (Anat.)
Definition: Anything crescent-shaped; a crescent-shaped part or mark; a
lunula, a lune.
2. (Chem.)
Definition: A lune. See Lune.
3. (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.
Source: Webster’s Unabridged Dictionary 1913 Edition