Source : WordNet®

hydrofoil
     n 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"
          [syn: {foil}]
     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"
        [syn: {hydroplane}]