port·hole

[pawrt-hohl, pohrt-]
noun
1.
a round, windowlike opening with a hinged, watertight glass cover in the side of a vessel for admitting air and light. Compare port4 ( def 1 ).
2.
an opening in a wall, door, etc., as one through which to shoot.

Origin:
1585–95; port4 + hole

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
porthole (ˈpɔːtˌhəʊl) [Click for IPA pronunciation guide]
 
n
1.  Sometimes shortened to: port a small aperture in the side of a vessel to admit light and air, usually fitted with a watertight glass or metal cover, or both
2.  an opening in a wall or parapet through which a gun can be fired; embrasure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Porthole is always a great word to know.
So is gobo. Does it mean:
the offspring of a zebra and a donkey.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

porthole
1591, from port (2) + hole.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They are patching a number of new openings left by porthole covers and
  equipment that have fallen off the tug.
Sunlight coming in through the porthole could be clearly seen.
Additionally, porthole is a cruise magazine for both businesses and consumers.
Suction draws disk material, which has the texture of crab meat, into a
  porthole near the probe's tip.
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