名詞 half-moon:

1. the crescent-shaped area at the base of the human fingernail
   同義詞：lunula, lunule
2. the time at which the moon is at first or last quarter when half its face is illuminated

half-moon

n.（名詞）
The moon when only half its disk is illuminated.
半月：月輪只能被看到一半時的月亮
Something, such as the lunula of a fingernail, that is shaped like a crescent.
半月形的：如半月瓣指甲似的東西，有著新月樣的形狀