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porthole

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.02 sec.
porthole
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

porthole [′port‚hōl]
(design engineering)
The opening or passageway connecting the inside of a bit or core barrel to the outside and through which the circulating medium is discharged.
(engineering)
A circular opening in the side of a ship or airplane, usually serving as a window and containing one or more panes of glass.


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? Mentioned in ? References in classic literature
 
Remained only a sea-chest and two suit-cases, themselves too large for the porthole but bare of contents.
He clung to the frame of the porthole as the airship tossed and swayed, and stared down through the light rain that now drove before the wind, into the twilight streets, watching people running out of the houses, watching buildings collapse and fires begin.
There was not a porthole on the grimy glass of which you might not have written with your finger "Dirty pig"; and she had already written it on several.
 
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