noun. A semicircular or semielliptical window, often with sash bars arranged like the ribs of a fan, usually placed over a door or another window.

noun. A transom.

noun. a semicircular or semioval window over a door or other window, normally having a fan-like structure of ribs; sometimes hinged to the transom

noun. a window in a roof to admit daylight

noun. a window above a door that is usually hinged to a horizontal crosspiece over the door

noun. a semicircular window over a door or window; usually has sash bars like the ribs of a fan

"He found that he was in a grotto, went towards the opening, and through a kind of fanlight saw a blue sea and an azure sky."