(n) 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, Syn. foil, Example:the fins of a fish act as hydrofoils
(n) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds, Syn. hydroplane, Example:the museum houses a replica of the jet hydroplane that broke the record