[ hahy-druh-foil ]
/ ˈhaɪ drəˌfɔɪl /


Naval Architecture. a surface form creating a thrust against water in a direction perpendicular to the plane approximated by the surface.
  1. a winglike member having this form, designed to lift the hull of a moving vessel.
  2. a vessel equipped with hydrofoils.

Origin of hydrofoil

First recorded in 1915–20; hydro-1 + foil2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for hydrofoil

  • It acted as a hydrofoil, its forward motion pulling it deeper into the water.

    The Wailing Octopus|Harold Leland Goodwin
  • Albanian sources claim that a dozen newer torpedo boats have been supplied by the Chinese, six of them hydrofoil types.

British Dictionary definitions for hydrofoil

/ (ˈhaɪdrəˌfɔɪl) /


a fast light vessel the hull of which is raised out of the water on one or more pairs of fixed vanes
any of these vanes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012