lune /ˈlun/
  弓形,半月形,半月形物
  Lune n.
  1. Anything in the shape of a half moon. [R.]
  2. Geom. A figure in the form of a crescent, bounded by two intersecting arcs of circles.
  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.
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