From Longman Dictionary of Contemporary Englishportholeport‧hole /ˈpɔːthəʊl $ ˈpɔːrthoʊl/ noun [countable] TTWa small round window on the side of a ship or plane
Examples from the Corpus
porthole• Before going ashore, secure hatches and lock all portholes and doors.• This will change the voltage at any porthole whose current line is affected, and the appropriate voltmeter will register the fact.• He looked out his porthole, a diamond-shaped window in the door.• Rostov peered past the screen at the porthole, but he could see nothing of the surface of the planet.• The Doctor found the porthole to the otherworld almost instinctively.• She knelt up and peered through the tiny porthole.• Basler have chosen to alter the cabin glazing to porthole style.• All cabins are outside, with porthole, have private facilities and air-conditioning.Origin porthole (1500-1600) port ( → PORT5) + hole 