Definition of hydroplane in US English:



  • 1A light, fast motorboat designed to skim over the surface of 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.’
    • ‘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.’
    • ‘With all these questions heavily on my mind, I boarded a four-seat Cessna 206 hydroplane for a 40-minute flight to the shores of Fraser Lake in the depth of Alaskan wilderness.’
    • ‘A couple of canoers were out paddling, and a hydroplane came in for a lake landing.’
    • ‘He nodded, staring out over the clear water to where the hydroplane was now visible, a dot on the horizon.’
  • 2A movable horizontal attachment that enables a moving submarine to rise or fall in the water.

    • ‘The fore and aft hydroplanes are still in position and the external torpedo tubes on the bow are a very impressive sight.’
    • ‘The A7 was the first submarine in the Royal Navy to be fitted with hydroplanes on her conning tower.’
    • ‘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!’
    • ‘Hatches are intact, periscope housings in place, propeller-shafts and control rods stick out of the stern alongside intact hydroplanes and rudder.’
    • ‘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.’
  • 3US A seaplane.

    • ‘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.’
    • ‘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.’


[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’
    • ‘A car hit this standing water, hydroplaned off the road, and crashed, killing the driver.’
    • ‘Thin tread causes the tire to hydroplane - riding up on a film of water and losing contact with the pavement, similar to driving on ice.’
    • ‘Markus headed for some old airplanes trying to go around them only to have his car hydroplane on a mixture of water and oil.’
    • ‘Jenny's mom had hydroplaned and skidded off the road.’
    • ‘When I reapplied the brakes, the right tire probably made contact with the surface, while the left tire still was hydroplaning, thus the pull to the right.’