lune

noun4

1. •
   A concave figure formed by the intersection of the arcs of two circles on a plane, or on a sphere the intersection between two great semicircles.
2. •
   Anything crescent-shaped.
3. •
   A leash for a hawk.
4. •
   (no longer used) A fit of lunacy or madness; a period of frenzy; a crazy or unreasonable freak.

   • Why woman, your husband is in his olde Lunes againe: […] — 1597