hydro foil

hydrofoil

[hahy-druh-foil]
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 + foil2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydrofoil (ˈhaɪdrəˌfɔɪl)
 
n
1.  a fast light vessel the hull of which is raised out of the water on one or more pairs of fixed vanes
2.  any of these vanes

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
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, © 2010 Douglas Harper
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