pontoon: Meaning and Definition of

pon•toon

1. 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. a float for raising a sunken or deeply laden vessel in the water; a camel or caisson.
4. a seaplane float.

pon•toon

1. the card game twenty-one.