From Longman Dictionary of Contemporary Englishhydrofoilhy‧dro‧foil /ˈhaɪdrəfɔɪl/ noun [countable] TTWa large boat with wing-shaped parts on the bottom that lift it above the surface of the water when it travels fast → hovercraft
Examples from the Corpus
hydrofoil• From here regular hydrofoils and ferries connect to Garda, Malcesine and Riva, so getting about is never a problem.• Much more fun are the hydrofoils which ply up and down the lake.• There is the fast and comfortable jetfoil, the hydrofoil or the more leisurely ferry.• The hydrofoil entered the harbour, revealing the characteristic wooden docks, with brightly-painted buildings sticking out the fjord on spidery sticks.• The hydrofoil had done four return journeys before its driver began to get really worried.Origin hydrofoil (1900-2000) hydro- + foil, on the model of airfoil 