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pontoon

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(pän to̵̅o̅n′)

noun

a flat-bottomed boat
any of a number of these, or of some other floating objects, as hollow cylinders, used as supports for a temporary bridge ()
a float on an aircraft

Origin: Fr ponton < L ponto < pons (gen. pontis), a bridge: see pons

Also ☆ ponton

See pontoon in American Heritage Dictionary 4

noun

A floating structure, such as a flatbottom boat, that is used to support a bridge.
A floating structure serving as a dock.
A float on a seaplane.

Origin:

Origin: French ponton

Origin: , from Old French

Origin: , from Latin pontō, pontōn-, floating bridge

Origin: , from pōns, pont-, bridge; see pent- in Indo-European roots

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