Main Entry:

¹pon·toon

Pronunciation:

\pän-ˈtün\

Function:

noun

Etymology:

French ponton, from Old French, from Latin ponton-, ponto

Date:

1690

1: a flat-bottomed boat (as a lighter) ; especially : a flat-bottomed boat or portable float used in building a floating temporary bridge2: a float especially of a seaplane