Definition of pontoon noun from the Oxford Advanced American Dictionary

     

    pontoon

     noun
    noun
    NAmE//pɑnˈtun//
     
     
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  1. 1a temporary floating platform built across several boats or hollow structures, especially one used for tying boats to
  2. 2 a boat or hollow structure that is one of several used to support a floating platform or bridge a pontoon bridge
See the Oxford Advanced Learner's Dictionary entry: pontoon