Side-light

sidelight

[sahyd-lahyt]
noun
1.
an item of incidental information.
2.
either of two lights carried by a vessel under way at night, a red one on the port side and a green on the starboard.
3.
light coming from the side.
4.
a window or other aperture for light in the side of a building, ship, etc.
5.
a window at the side of a door or another window.

Origin:
1600–10; side1 + light1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sidelight (ˈsaɪdˌlaɪt)
 
n
1.  light coming from the side
2.  a side window
3.  either of the two navigational running lights used by vessels at night, a red light on the port and a green on the starboard
4.  (Brit) either of two small lights on the front of a motor vehicle, used to indicate the presence of the vehicle at night rather than to assist the driver
5.  additional or incidental information

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

sidelight
1610, "light coming from the side," from side + light (n.). Meaning "incidental information on a subject" is attested from 1862.
Online Etymology Dictionary, © 2010 Douglas Harper
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