Part of speech: noun

A small opening in a ships side, as for a cannon.

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Usage examples "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", Arnold Bennett.
  2. Just over his head there was a small porthole, through which he peered. - "Jerusalem", Selma Lagerlöf.
  3. 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", G. A. Henty.