Lune (?), n. [L. luna moon: cf. F. lune. See Luna.]
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.
© Webster 1913.