Etymology
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hydroplane (n.)

"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- + ending from airplane.

hydroplane (v.)

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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Definitions of hydroplane
1
hydroplane (n.)
an airplane that can land on or take off from water;
the designer of marine aircraft demonstrated his newest hydroplane
Synonyms: seaplane
hydroplane (n.)
a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds;
the museum houses a replica of the jet hydroplane that broke the record
Synonyms: hydrofoil
2
hydroplane (v.)
glide on the water in a hydroplane;
Synonyms: seaplane
From wordnet.princeton.edu