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

a round, windowlike opening with a hinged, watertight glass cover in the side of a vessel for admitting air and light.
Compare 4 (def 1).
an opening in a wall, door, etc., as one through which to shoot.
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

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

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