[pawrt-hohl, pohrt-]
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.

1585–95; port4 + hole

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World English Dictionary
porthole (ˈpɔːtˌhəʊl)
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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Word Origin & History

1591, from port (2) + hole.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The second porthole, slightly to the rear of the first, looks into the engine's
Sunlight coming in through the porthole could be clearly seen.
Secret porthole staterooms allow you to have an outside stateroom at the same
  price that you would pay for an indoor cabin.
These include the interior rooms and several exterior rooms with a porthole
  overlooking the ocean.
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