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1. (nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge
    
2. A float supporting a seaplane
    
3. [Brit] A gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21
   - blackjack, twenty-one, vingt-et-un

Derived forms: pontoons

Type of: barge, card game, cards, flatboat, float, hoy, lighter

Part of: amphibian, amphibious aircraft, bateau bridge, floating bridge, pontoon bridge

Encyclopedia: Pontoon, County Mayo