floor-level window; low window
A window set close to the floor, often found in traditional Japanese architecture or modern designs for natural light and ventilation near ground level.
茶室には地窓が設けられ、床近くから柔らかな光が差し込む。
In the tea room, a floor-level window is installed, and soft light enters from near the floor.
Compound of 地 (ground, floor) and 窓 (window). The reading じまど follows standard on'yomi for both characters.