lune1

[loon] /lun/
noun
1.
anything shaped like a crescent or a half moon.
2.
a crescent-shaped figure bounded by two arcs of circles, either on a plane or a spherical surface.
Origin
1695-1705; < Latin lūna moon

lune2

[loon] /lun/
noun, Falconry.
1.
a line for securing a hawk.
Origin
1425-75; late Middle English, variant of loyn < Middle French loigne longe
British Dictionary definitions for lune

lune1

/luːn/
noun
1.
  1. a section of the surface of a sphere enclosed between two semicircles that intersect at opposite points on the sphere
  2. a crescent-shaped figure formed on a plane surface by the intersection of the arcs of two circles
2.
something shaped like a crescent
3.
(RC Church) another word for lunette (sense 6)
Word Origin
C18: from Latin lūna moon

lune2

/luːn/
noun
1.
(falconry) a leash for hawks or falcons
Word Origin
C14 loigne, from Old French, from Medieval Latin longia, longea, from Latin longuslong1
Word Origin and History for lune
n.

figure formed by two arcs of circles, 1704, from Latin luna "moon; crescent-shaped badge" (see luna).