2 a window in a roof to admit daylight [syn: skylight]
3 a semicircular window over a door or window; usually has sash bars like the ribs of a fan
A fanlight is a window, semicircular or semi-elliptical in shape, with glazing bars or tracery sets radiating out like an open fan, It is placed over another window or a doorway. and is sometimes hinged to a transom. The bars in the fixed glazed window spread out in the manner a sunburst. It is also called a "sunburst light".
A chiefly British use of the word is to mean "transom". Ariah Park, New South Wales