Definition of hydroplane in English:

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Pronunciation: /ˈhīdrəˌplān/


1A light fast motorboat designed to skim over the surface of water.
Example sentences
  • Their run established a new world and national record as part of Windermere Records Week which saw high-speed watercraft - from one-man hydroplanes to offshore Formula 1 powerboats - take to the water.
  • Since small outboard race boats are one of Montgomery's passions - he has five hydroplanes in his 15-boat fleet - the museum will include a section devoted to outboard racing, complete with a few boats and trophies.
  • He nodded, staring out over the clear water to where the hydroplane was now visible, a dot on the horizon.
2A finlike attachment that enables a moving submarine to rise or fall in the water.
Example sentences
  • Upstairs houses interactive tests for youngsters from mechanical diving suit arms to the art of driving a submarine using hydroplanes and the knack of positive and negative buoyancy.
  • Stubborn had survived one of the worst attacks of the war, despite the loss of her aft hydroplanes and rudder, and had carried out the deepest-ever dive at the time, to an estimated 165m!
  • The A7 was the first submarine in the Royal Navy to be fitted with hydroplanes on her conning tower.
3US A seaplane.
Example sentences
  • This park has a rich history dating back to 1927 when Italy's then leader, Mussolini, built a non-military airport for the landing of hydroplanes from outlying lakes.
  • Next, the man declares that he would like to take Nick flying in his hydroplane.
  • A dozen of the country's top scientists and intellectuals climbed aboard a hydroplane and flew out into the Bay of Rio to welcome him.


[no object] North American
(Of a vehicle) slide uncontrollably on the wet surface of a road: a motorist whose car hydroplaned and crashed into a tree
More example sentences
  • Jenny's mom had hydroplaned and skidded off the road.
  • Markus headed for some old airplanes trying to go around them only to have his car hydroplane on a mixture of water and oil.
  • A car hit this standing water, hydroplaned off the road, and crashed, killing the driver.
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