half-moon

Short definition from Wiktionary

Noun

1. 1
   The moon in its first or last quarter when only half the visible face is illuminated; a quarter moon.
2. 2
   Anything shaped like a crescent, especially the base of a fingernail.
3. 3
   A semicircular or crescent-shaped Filipino butter cookie.
4. 4
   Synonym of black and white (“type of cookie”).
5. 5
   Alternative form of half-moon.