Definitions of hydrofoil:
- noun: a speedboat that is equipped with hydrofoils that lift it so that it skims the water at high speeds
- noun: 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
Example: "The fins of a fish act as hydrofoils"
Search for hydrofoil at other dictionaries: OneLook, Oxford, American Heritage, Merriam-Webster, Wikipedia