hydrofoil

noun

hy·​dro·​foil ˈhī-drə-ˌfȯi(-ə)l 

1

: a body similar to an airfoil but designed for action in or on water

2

: a motorboat that has metal plates or fins attached by struts fore and aft for lifting the hull clear of the water as speed is attained

Illustration of hydrofoil

• hydrofoil 2

Examples of hydrofoil in a Sentence

Recent Examples on the Web

The hydrofoil tested in the study carried two rows of these coils, each powered by small electrical motors called actuators. —Atharva Gosavi, Interesting Engineering, 5 Sep. 2025

Once on its hydrofoil, a Candela boat can go much further on the same battery capacity as a conventional vessel without this technology. —James Morris, Forbes.com, 9 Aug. 2025

Regent explains that the hydrofoils allow the Vicreroy to operate like a boat outside harbor areas, giving it the speed, maneuverability and choppy water stability that failed ekranoplans lacked. —New Atlas, 9 July 2025

The hydrofoil technology of the F50s gives them the ability to travel at more than 50 knots. —Andrew Rice, The Athletic, 13 Mar. 2025

Word History

First Known Use

1919, in the meaning defined at sense 1

Rhymes for hydrofoil

• aerofoil
• cinquefoil
• quatrefoil
• airfoil
• benzoyl
• despoil
• embroil
• etoile
• gargoyle
• recoil
• subsoil
• tinfoil

Kids Definition

hydrofoil

noun

hy·​dro·​foil ˈhī-drə-ˌfȯil 

: a boat that has fins attached to the bottom by braces for lifting the hull clear of the water to allow faster speeds