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Definition of: pontoon
(pon·t
n′) noun
1. A flat–bottomed boat, an airtight cylinder, or the like, used in the construction of floating bridges, to support the roadway.
2. A bridge so supported: in the United States Army, usually ponton.
3. A float or a raft to ferry goods across water.
4. A float on the landing gear of a hydroplane. [<OF ponton <L ponto, pontonis <pons, pontis a bridge]
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