port-hole

porthole

[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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
porthole (ˈpɔːtˌhəʊl)
 
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
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Etymonline
Word Origin & History

porthole
1591, from port (2) + hole.
Online Etymology Dictionary, © 2010 Douglas Harper
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