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Pontoon

pɒnˈtuːn

Pontoon definitions
noun
pontoon pontoons
  1. a flat-bottomed boat or hollow metal cylinder used with others to support a temporary bridge or floating landing stage

    "a pontoon bridge"

    • a bridge or landing stage supported by pontoons
    • each of a pair of floats fitted to an aircraft to enable it to land on water
  2. a large flat-bottomed barge or lighter equipped with cranes and tackle for careening ships and salvage work