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floatplane

or float plane

[floht-pleyn]
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noun Aeronautics.
  1. a seaplane having landing gear consisting of one or more floats.
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Compare flying boat.

Origin of floatplane

First recorded in 1920–25; float + plane1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018