noun
A window that projects vertically from a sloping roof. The term ドーマーウインドー is also used.
See also: ドーマーウインドー
屋根裏部屋には屋根窓が付いていて、明るい。
The attic room has a dormer window and is bright.
Skylight; a window set into the roof itself, not projecting outward like a dormer.
Compound of 屋根 (roof) and 窓 (window).