Learn how to say Pontoon correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word pontoon:
1a flat-bottomed boat or hollow metal cylinder used with others to support a temporary bridge or floating landing stage:
a pontoon bridge
a bridge or landing stage supported by pontoons.
each of a pair of floats fitted to an aircraft to enable it to land on water.
2a large flat-bottomed barge or lighter equipped with cranes and tackle for careening ships and salvage work.
late 17th century: from French ponton, from Latin ponto, ponton-, from pons, pont- ‘bridge’