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hydrofoil

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hy⋅dro⋅foil

  [hahy-druh-foil]
Use hydrofoil in a Sentence
–noun
1. Naval Architecture. a surface form creating a thrust against water in a direction perpendicular to the plane approximated by the surface.
2. Nautical.
a. a winglike member having this form, designed to lift the hull of a moving vessel.
b. a vessel equipped with hydrofoils.
Origin:
1915–20; hydro- 1 + foil 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hy·dro·foil   (hī'drə-foil')   
n.  

  1. 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.

  2. A boat equipped with hydrofoils. Also called hydroplane.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

hydrofoil 
1920, "boat that travels through water on wings," formed in Eng. from hydro-, comb. form of Gk. hydor "water" (see water (n.1)) + foil (n.).
Online Etymology Dictionary, © 2001 Douglas Harper
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Encyclopedia

hydrofoil

underwater fin with a flat or curved winglike surface that is designed to lift a moving boat or ship by means of the reaction upon its surface from the water through which it moves. Ships that use hydrofoils, or foils, are themselves called hydrofoils. Hydrofoils can lift a boat's hull clear of the water as speed increases, and the resultant reduction in drag yields higher speeds without expending more horsepower.

Learn more about hydrofoil with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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