clerestory
/ˈklɪrˌstɔri/
noun
- A row of windows in the upper part of a wall, especially in a church or large building, that lets in light.
- Modern architects sometimes include a clerestory to brighten a room without sacrificing wall space.
- The ancient basilica had a clerestory with beautiful stained glass.
- The cathedral's clerestory flooded the nave with warm sunlight.