What does the word porthole mean?

Usage examples for porthole

  1. Then a Margate passenger steamer, its electric lights gleaming from every porthole, swerved round to anchor, with its load of two thousand fatigued excursionists. – The Grand Babylon Hotel by Arnold Bennett
  2. Very quietly he crawled out through the porthole, and then raised himself and stood on the muzzle of the gun. – The Bravest of the Brave or, with Peterborough in Spain by G. A. Henty