D defs.my
Entry 3 senses Webster, 1913

Lune

/(lūn)/ · IPA /luːn/
01 n. Anything in the shape of a half moon.
  1. 1.
    Anything in the shape of a half moon.[R.]
  2. 2.
    A figure in the form of a crescent, bounded by two intersecting arcs of circles.(Geom.)
  3. 3.
    A fit of lunacy or madness; a period of frenzy; a crazy or unreasonable freak.[Obs.]
    “These dangerous, unsafe lunes i' the king.” Shak.