a seaplane.
an attachment to an airplane enabling it to glide on the water.
a light, high-powered boat, especially one with hydrofoils or a stepped bottom, designed to plane along the surface of the water at very high speeds.
a horizontal rudder for submerging or elevating a submarine.
verb (used without object), hydroplaned, hydroplaning.
to skim over water in the manner of a hydroplane.
to travel in a hydroplane.
Also, aquaplane. (of a vehicular tire or vehicle) to ride on a film of water on a wet surface with a resulting decrease in braking and steering effectiveness.

1900–05; hydro-1 + plane1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydroplane (ˈhaɪdrəʊˌpleɪn)
1.  a motorboat equipped with hydrofoils or with a shaped bottom that raises its hull out of the water at high speeds
2.  an attachment to an aircraft to enable it to glide along the surface of water
3.  another name (esp US) for a seaplane
4.  a horizontal vane on the hull of a submarine for controlling its vertical motion
5.  (intr) (of a boat) to rise out of the water in the manner of a hydroplane

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1904, coined in Amer.Eng. with sense of "motorboat that glides on the surface of water," from hydro-, comb. form of Gk. hydor "water" + plane (from airplane). The verb is first attested 1914, "to skim the surface of water by use of hydroplanes;" meaning "skid on a thin layer of water" (esp. of automobile
tires) first recorded 1962, properly aquaplane (1961 in this sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Insects that land on the rim of the pitcher hydroplane on the liquid and tumble
If you begin to hydroplane, take your foot off the accelerator and slow down.
Water on the road can cause a vehicle to hydroplane.
If you begin to hydroplane, hold the wheel steady, take your foot from the gas
  pedal and gently pump the brake.
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