lunate

/L UW1 N AH0 T/
noun
  1. 1

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

  2. 2

    The lunate bone

adjective
  1. 1

    Shaped like a crescent.

    a lunate beak

Source: https://en.wiktionary.org/wiki/lunate