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Definition 2024

fanlight ‎(plural fanlights)

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.

semioval window with a fan-like structure of ribs