Pontoon

pon-tōōn′, n. a flat kind of boat used in forming a bridge for the pa age of an army: a bridge of boats: a lighter or barge used for loading or unloading ships—also Pon′ton .— ns. Pontonier′ , Pontonnier′ , one who has charge of a pontoon; Pontoon′-bridge , a platform or roadway supported upon pontoons. [Fr. ponton —L. pons , a bridge.]