Etymology
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hydrofoil (n.)

1959, "boat that travels through water on wings," short for hydrofoil boat, hydrofoil being originally the name of the "wings" themselves (1920); formed in English from hydro- + foil (n.).

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Definitions of hydrofoil

hydrofoil (n.)
a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through;
the fins of a fish act as hydrofoils
Synonyms: foil
hydrofoil (n.)
a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds;
Synonyms: hydroplane
From wordnet.princeton.edu