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Noun porthole has 2 senses
  1. porthole - a window in a ship or airplane
    --1 is a kind of     window
    --1 is a part of ship; fuselage
    --1 has part: deadlight
  2. port, embrasure, porthole - an opening (in a wall or ship or armored vehicle) for firing through
    --2 is a kind of opening
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