Half-Moon

Part of speech: noun (n.)

1. The moon at the quarters, when half its disk appears illuminated.

2. The shape of a half-moon; a crescent. See how in warlike muster they appear, In rhombs, and wedges, and half-moons, and wings. Milton.

3. An outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; -- now called a ravelin.

4. A marine, sparoid, food fish of California (Cæsiosoma Californiense). The body is ovate, blackish above, blue or gray below. Called also medialuna.