pontoon

Noun
  1. (nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge (synset 103987924)
    referred to in: boat - a small vessel for travel on water
    is a type of: barge, flatboat, hoy, lighter - a flatbottom boat for carrying heavy loads (especially on canals)
    is a part of: bateau bridge, floating bridge, pontoon bridge - a temporary bridge built over a series of pontoons
  2. A float supporting a seaplane (synset 103987822)
    is a type of: float - something that floats on the surface of water
    is a part of: amphibian, amphibious aircraft - an airplane designed to take off and land on water

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