Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A winglike structure attached to the hull of a boat that raises all or part of the hull out of the water when the boat is moving forward, thus reducing drag.
  • noun A boat equipped with hydrofoils.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun nautical A wing attached to the hull of a ship that raises it out of the water when travelling at speed and thus reduces drag.
  • noun nautical A vessel equipped with such a device.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
  • noun 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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hydro- +‎ foil

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