noun
hole cut in a wall or panel to let in light
Refers to an opening cut into a wall, partition, or paneling, often for light or ventilation. Common in traditional Japanese architecture.
古い家の壁に切り窓が設けられていた。
A hole had been cut in the wall of the old house to let in light.
茶室の切り窓から柔らかな光が差し込む。
Soft light streams in through the small window cut into the tea room.
窓 is a general window, while 切り窓 specifically refers to an opening cut into a wall or panel, often without glass.
Compound of 切り (kiri, 'cutting') + 窓 (mado, 'window'), literally 'cut window'.