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From The Collaborative International Dictionary of English v.0.48:
Lune \Lune\ (l[=u]n), n. [L. luna moon: cf. F. lune. See Luna.] 1. Anything in the shape of a half moon. [R.] [1913 Webster] 2. (Geom.) A figure in the form of a crescent, bounded by two intersecting arcs of circles. [1913 Webster] 3. A fit of lunacy or madness; a period of frenzy; a crazy or unreasonable freak. [Obs.] [1913 Webster] These dangerous, unsafe lunes i' the king. --Shak. [1913 Webster]