Pronunciation: (hī'dru-foil"), [key]
1. Naval Archit.a surface form creating a thrust against water in a direction perpendicular to the plane approximated by the surface.
a. a winglike member having this form, designed to lift the hull of a moving vessel.
b. a vessel equipped with hydrofoils.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.