pon ‧ toon /pɒnˈtuːn $ pɑːn-/ BrE AmE noun
[ Date: 1600-1700 ; Language: French ; Origin: ponton 'floating bridge' , from Latin ponto , from pons 'bridge' ]
1 . [countable] one of several metal containers or boats that are fastened together to support a floating bridge
2 . [countable] one of two hollow metal containers fastened to the bottom of a plane so that it can come down onto water and float
3 . [uncountable] British English a card game, usually played for money SYN blackjack American English