skylight

English

Oculus in ceiling of the Pantheon in Rome (Italy) (sense 1)

From sky +‎ light.

skylight (plural skylights)

(architecture) A window, dome, or opening in the roof or ceiling, to admit natural light.
Synonym: oculus
(physics) Diffuse sky radiation—solar radiation reaching the earth's surface after having been scattered from the direct solar beam by molecules or suspensoids in the atmosphere.
(volcanology) A hole in the upper part of a lava tube, yielding a view of the lava within.
A region of flat, thin ice allowing a submarine to surface.

window dome or opening in the roof

Armenian: երդիկ (hy) (erdik)
Bulgarian: тавански прозорец (tavanski prozorec)
Catalan: claraboia (ca), lluerna (ca)
Chinese:
Mandarin: 天窗 (zh) (tiānchuāng)
Danish: tagvindue (da)
Dutch: zonnedak (nl) n, koepel (nl) m
Finnish: kattoikkuna (fi) (window); kattokupu, kattovalokupu (dome); valoaukko (opening)
French: fenêtre de toit (fr) f, lucarne (fr) f, vélux (fr) m, verrière (fr) f
Galician: bufarda (gl) f, claraboia f
German: Dachluke (de) f, Dachfenster (de) n, Dachflächenfenster n
Hebrew: צֹהַר (he) m (tsohar)
Hungarian: tetőablak (hu)
Irish: spéirléas m, forléas m, fuinneog dhín f
Italian: lucernario (it) m
Japanese: 天窓 (ja) (てんまど, tenmado)
Korean: 채광창(採光窓) (chaegwangchang)
Norwegian:
Bokmål: takvindu n
Polish: świetlik (pl) m
Portuguese: claraboia (pt)
Romanian: lucarnă (ro), luminator (ro) n
Russian: светово́й люк m (svetovój ljuk)
Scottish Gaelic: leòsan-adhair m
Serbo-Croatian: svetlarnik m, krovni ptozor m
Spanish: tragaluz (es) m, claraboya (es) f, celaje (es) m
Swedish: ljusöppning c, takfönster (sv), taklucka (sv) c
Tagalog: luneto
Turkish: aydınlık (tr)
Ugaritic: 𐎜𐎗𐎁𐎚 (ủrbt)
Volapük: nufalitöp
Welsh: ffenestr do f

solar radiation

hole in a lava tube

Borrowed from English skylight. First attested in 1840.

skylight n