Caesiosoma Californiense

Half-moon Half"-moon` (-m[=oo]n`), n. 1. The moon at the quarters, when half its disk appears illuminated. [1913 Webster]

2. The shape of a half-moon; a crescent. [1913 Webster]

See how in warlike muster they appear, In rhombs, and wedges, and half-moons, and wings. --Milton. [1913 Webster]

3. (Fort.) An outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; -- now called a {ravelin}. [1913 Webster]

4. (Zo["o]l.) A marine, sparoid, food fish of California ({C[ae]siosoma Californiense}). The body is ovate, blackish above, blue or gray below. Called also {medialuna}. [1913 Webster]