Shaped like a crescent.

(archaeology) A small stone artifact, probably an arrowhead, with a blunt straight edge and a sharpened, crescent-shaped back, especially characteristic of the Mesolithic Period

plural of lunate

lunate; crescent-shaped

In a lunate manner.

An insane person.

Crazed, mad, insane, demented.

A month of an average of approximately 29.53 days, measured from a lunar phase until the return of that same phase. / The irregular period from one new moon until the next.

plural of lunation

plural of lunatic