hydrofoil

n. structure attached to a boat designed to lift the hull above the water in order to increase the boat's speed; boat equipped with a structure that serves to increase speed by lifting the hull above the water

A hydrofoil is a boat with wing-like foils mounted on struts below the hull. As the craft increases its speed the hydrofoils develop enough lift for the boat to become foilborne - i.e. to raise the hull up and out of the water. This results in a great reduction in drag and a corresponding increase in speed.
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Noun
1. 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"
(synonym) foil
(hypernym) device
2. a speedboat that is equipped with hydrofoils 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"
(synonym) hydroplane
(hypernym) speedboat

n. hydrofoil, structure attached to a boat designed to lift the hull above the water in order to increase the boat's speed, boat equipped with a structure that serves to increase speed by lifting the hull above the water

hydrofoil
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