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porthole

[pawrt-hohl, pohrt-] /ˈpɔrtˌhoʊl, ˈpoʊrt-/
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 of porthole
1585-1595
1585-95; port4 + hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for porthole

porthole

/ˈpɔːtˌhəʊl/
noun
1.
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 Sometimes shortened to port
2.
an opening in a wall or parapet through which a gun can be fired; embrasure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for porthole
n.

also port-hole, 1590s, from port (n.2) + hole (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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13
14
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