Etymology

fanlight

fan·light
F4A1N1L1I1G2H4T1

Today it means: A semicircular or semioval window over a door or other window, normally having a fan-like structure of ribs; sometimes hinged to the transom. Full definition →

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The story

From fan + light (“window; source of illumination”).

Etymology from Wiktionary, CC BY-SA 4.0.