'hydrofoil' definitions:

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" [syn: hydrofoil, foil]

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" [syn: hydrofoil, hydroplane]