fanlight

From fan + light (“window”)

fanlight (plural fanlights)

1. a semicircular or semioval window over a door or other window, normally having a fan-like structure of ribs; sometimes hinged to the transom
   • 1982, John Banville, The Newton Letter

     It turned out to be a big gloomy pile with ivy and peeling walls and a smashed fanlight over the door, the kind of place where you picture a mad stepdaughter locked up in the attic.

• light

• dummy fanlight