名詞 fanlight:

1. a window above a door that is usually hinged to a horizontal crosspiece over the door
   同義詞：transom, transom window
2. a window in a roof to admit daylight
   同義詞：skylight
3. a semicircular window over a door or window; usually has sash bars like the ribs of a fan

fan.light

n.（名詞）
Architecture A half-circle window, often with sash bars arranged like the ribs of a fan.
【建筑學】 扇形窗：門或窗上有扇骨狀放射格條的半圓形窗
Chiefly British A transom.
【多用于英國】 氣窗