noun
moon visible in the morning; waning crescent moon at dawn
Refers specifically to the moon that remains visible in the morning sky, typically a waning crescent. Often used in poetic or literary contexts.
夜明け前、東の空に残月が白く輝いていた。
Before dawn, the morning moon shone white in the eastern sky.
Compound of 残 (ざん, 'remaining') and 月 (げつ, 'moon'), literally 'remaining moon'. The reading ざんげつ is the standard on'yomi combination.