hydrofoil -
a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds; "the museum houses a replica of the jet hydroplane that broke the record"
hydrofoil -
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; "the fins of a fish act as hydrofoils"
A hydrofoil is a wing-like structure mounted on struts below the hull of a boat, which lifts the boat partially out of the water during forward motion, in order to reduce drag. As a synecdoche, the term "hydrofoil" is often used to refer to any boat that utilizes hydrofoil technology. Hydrofoils are similar in appearance and purpose to airfoils.
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hydrofoil 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.