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[hahy-druh-pleyn] /ˈhaɪ drəˌpleɪn/

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.
a motorboat equipped with hydrofoils or with a shaped bottom that raises its hull out of the water at high speeds
an attachment to an aircraft to enable it to glide along the surface of water
another name (esp US) for a seaplane
a horizontal vane on the hull of a submarine for controlling its vertical motion
(intransitive) (of a boat) to rise out of the water in the manner of a hydroplane

“motorboat that glides on the surface of water,” 1895, coined by U.S. engineer Harvey D. Williams [“Sibley Journal of Engineering,” Cornell University, vol. X, p.81]; from hydro- + plane (from airplane).

by 1908, “to skim the surface of water by use of hydroplanes,” from hydroplane (n.). Meaning “skid on a thin layer of water” (especially of automobile tires) first recorded 1962, properly aquaplane (itself from 1961 in this sense). Related: Hydroplaned; hydroplaning.


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    [hahy-druh-noo-muh-tuh-zey-shuh n, -nyoo-] /ˌhaɪ drəˌnu mə təˈzeɪ ʃən, -ˌnyu-/ noun 1. utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to interfere with the rotor blades.

  • Hydropneumatosis

    hydropneumatosis hy·dro·pneu·ma·to·sis (hī’drō-nōō’mə-tō’sĭs, -nyōō’-) n. Presence of gas and liquid in tissues.

  • Hydropneumogony

    hydropneumogony hy·dro·pneu·mo·go·ny (hī’drō-nu-mō’gə-nē, -nyu-) n. The injection of air into a joint to determine the amount of effusion.

  • Hydropneumopericardium

    hydropneumopericardium hy·dro·pneu·mo·per·i·car·di·um (hī’drō-nōō’mō-pěr’ĭ-kär’dē-əm) n. The accumulation of serous fluid and gas in the pericardial sac. Also called pneumohydropericardium.

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