1. the crescent-shaped area at the base of the human fingernail (Freq. 1) • Syn: lunula, lunule • Hypernyms: area, region • Part Holonyms: nail 2. the time at which the Moon is at first or last quarter when half its face is illuminated • Hypernyms: phase of the moon • Hyponyms: first quarter, last quarter • Part Holonyms: month