noun. a window in a roof to admit daylight.
noun. a semicircular window over a door or window; usually has sash bars like the ribs of a fan.
noun. a window above a door that is usually hinged to a horizontal crosspiece over the door.
1. Noun, singular or mass The home has its original woodwork and open-hearth fireplace, and was one of the earliest in the city to feature a central hallway and fanlight.
