porthole

[ pawrt-hohl, pohrt- ]
/ ˈpɔrtˌhoʊl, ˈpoʊrt- /

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.

Origin of porthole

First recorded in 1585–95; port4 + hole

Example sentences from the Web for porthole

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 both Sometimes shortened to: port
an opening in a wall or parapet through which a gun can be fired; embrasure