English
fanlight
From fan + light (“window; source of illumination”).
A compound of fan + light ‘window’
Proto-Indo-European *h₂weh₁- ‘to blow’
Latin vannus ‘fan for winnowing grain’
Old English fann ‘a winnowing fan’
Middle English fan
English fan
Proto-Indo-European *lewk- ‘to shine’
…
Proto-Germanic *leuhtą
Proto-West Germanic *leuht ‘light’
Old English lēoht
Middle English light ‘light, illumination’
English light
Today it means
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.
Language periods are conventional ranges, not dates for this word.
Etymograph / fanlight