D defs.my
Entry 4 senses Webster, 1913

Half-moon

/(-mo͞on`)/ · Half·-moon · IPA
01 n. The moon at the quarters, when half its disk appears illuminated.
  1. 1.
    The moon at the quarters, when half its disk appears illuminated.
  2. 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. 3.
    An outwork composed of two faces, forming a salient angle whose gorge resembles a half-moon; -- now called a ravelin.(Fort.) Also: ravelin
  4. 4.
    A marine, sparoid, food fish of California (Caesiosoma Californiense). The body is ovate, blackish above, blue or gray below. Called also medialuna.(Zool.) Also: medialuna