/ˈlo͞oˌnāt/
Adjective
1. Shaped like a crescent. (wiktionary.org)
2. Resembling the new moon in shape. (wordnetweb.princeton.edu)
Noun, pl. lunates
1. A crescent-shaped carpal bone situated in the center of the wrist and articulating with the radius. (Google Dictionary)
2. (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. (wiktionary.org)
Word origin: From Latin lunatus, from luna