sky light

skylight

[skahy-lahyt]
noun
1.
an opening in a roof or ceiling, fitted with glass, for admitting daylight.
2.
the frame set with glass fitted to such an opening.
3.
Meteorology. the diffuse light from the sky, scattered by air molecules, as distinguished from the direct radiation from the sun.

Origin:
1670–80; sky + light1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
skylight (ˈskaɪˌlaɪt)
 
n
Also called: fanlight a window placed in a roof or ceiling to admit daylight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

skylight
1679, "light from the sky," from sky + light (n.). Meaning "small opening in a roof to admit light" is recorded from 1690.
Online Etymology Dictionary, © 2010 Douglas Harper
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