pontoon
1. (nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge • Topics: boat • Hypernyms: barge, flatboat, hoy, lighter • Part Holonyms: pontoon bridge, bateau bridge, floating bridge 2. a float supporting a seaplane • Hypernyms: float • Part Holonyms: amphibian, amphibious aircraft
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