Pronunciation: (pon-tOOn'),[key] —n. 1. Mil.a boat or some other floating structure used as one of the supports for a temporary bridge over a river.
2. a float for a derrick, landing stage, etc.
3. Naut.a float for raising a sunken or deeply laden vessel in the water; a camel or caisson.
4. a seaplane float. Also,pon•tonPronunciation: (pon'tn).[key]
Pronunciation: (pon-tOOn'),[key] —n.Brit. the card game twenty-one.