noun
small window; fenestella; scuttle
General term for a small window. Also used in architecture for a small window-like opening (fenestella) and in nautical contexts for a small hatch or scuttle on a ship.
この部屋には小窓が一つしかない。
This room has only one small window.
船の小窓から外の波が見えた。
I could see the waves outside through the ship's scuttle.