Etymology
Advertisement

pontoon (n.)

"flat-bottomed boat" (especially, in military engineering, one to support a temporary bridge over a river), 1670s, from French pontoon, from Old French ponton (14c.) "bridge, drawbridge, boat-bridge; flat-bottomed boat," from Latin pontonem (nominative ponto) "flat-bottomed boat," from pons "bridge" (see pons). Pontoon bridge "roadway supported on pontoons" is recorded by 1778. Related: Pontooneer (n.).

Others are reading

Advertisement
Advertisement
Definitions of pontoon

pontoon (n.)
(nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge;
pontoon (n.)
a float supporting a seaplane;
From wordnet.princeton.edu