"fanlight" in the noun sense
1. transom, transom window, fanlight
a window above a door that is usually hinged to a horizontal crosspiece over the door
2. skylight, fanlight
a window in a roof to admit daylight
3. fanlight
a semicircular window over a door or window usually has sash bars like the ribs of a fan
Source: WordNet® (An amazing lexical database of English)
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