noun · The moon when half of its face is illuminated, appearing as a semicircle during the first or last quarter.

一轮清冷的弦月挂在深蓝色的夜空中。

noun · Specific days of the lunar month (the 7th, 8th, 22nd, and 23rd) that coincide with the quarter moon phases.

农历的弦月之日，我们可以看到明显的半圆月相。