1A small window on the outside of a ship or aircraft.
- Outside cabins will either have a porthole or picture window depending on ship and/or position on ship.
- Indeed, outside the starboard porthole I saw a large fish, apparently captive, violently trying to disengage itself and in the process tearing some of the skin and flesh of its back.
- The style is of a luxury cruiser, with round windows looking like portholes and the gleaming white exterior the hull of a ship.
2 historical An opening for firing a cannon through.
- Like the stern accommodation, the ceilings have gone but the walls are partially intact, with circular openings left where portholes have been removed.
- The material reported ranges from the obligatory porthole to cannon and shot, several pieces of eight and a Charles I gold coin.
- From the early 1770s emigration brokers also began to respond to concerns about ventilation by including more and larger portholes in the designs of their newer vessels.
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