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pontoon /pɑnˈtuːn/  

  • noun
    plural -toons
    [count] :a large hollow container filled with air that is used to make a structure (such as a boat, airplane, or bridge) float on top of water
    They built a pontoon bridge. [=a bridge that floats on the water and is held up by pontoons]
    a pontoon plane [=an airplane that has pontoons on the bottom so that it can float on water]