Skylight — From English to English | etymologist.ai
skylight
/ˈskaɪ.laɪt/·noun·1680·Established
Origin
'Skylight' fuses OldNorse 'sky' (cloud) + Old English 'leoht' (light) — a window to the heavens.
Definition
A window installed in a roof or ceiling.
The Full Story
English17th centurywell-attested
A compound of 'sky' + 'light,' both of great antiquity. 'Sky' entered English from Old Norse 'sky' (cloud, sky), from Proto-Germanic *skiwja (cloud, shadow, covering), from PIE *skeu- (to cover, to conceal, to obscure). Thesame PIE root produced Latin 'obscurus' (covered, dark), English 'hide' (covering), 'hose' (a covering for the leg), 'house' (an enclosing cover), and 'scum' (what covers a liquid surface). Remarkably, Old English 'sky' meant specifically cloud, not the open firmament — the sense shift from 'cloud' to 'the visible
'Sky' originally meant 'cloud' in OldNorse — the visible cloud-cover overhead. The meaning shifted from 'clouds' to 'the space where clouds are' to 'the whole overhead expanse.' And 'skylight' is a poetic compound: it is the light of the sky let into a building — the clouds' own light (originally) brought indoors through a roof window.
in Indo-European, producing Latin 'lux/lucis' (light), 'luna' (moon, the bright one), 'lucere' (to shine), Greek 'leukos' (white, bright), and Sanskrit 'ruc-' (to shine). A skylight — a window set into a ceiling or roof — is first attested in the 17th century: the opening that makes sky-light enter the building, bringing the brightness of the heavens through a deliberate gap in the overhead covering. Key roots: *skeu- (Proto-Indo-European: "to cover, to hide (→ cloud → sky)"), *lewk- (Proto-Indo-European: "light, brightness").