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porthole

[ pawrt-hohl, pohrt- ]
/ ˈpɔrtˌhoʊl, ˈpoʊrt- /
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noun
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).
an opening in a wall, door, etc., as one through which to shoot.
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Origin of porthole

First recorded in 1585–95; port4 + hole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use porthole in a sentence

British Dictionary definitions for porthole

porthole
/ (ˈpɔːtˌhəʊl) /

noun
a small aperture in the side of a vessel to admit light and air, usually fitted with a watertight glass or metal cover, or bothSometimes shortened to: port
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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