hy ‧ dro ‧ foil /ˈhaɪdrəfɔɪl/ BrE AmE noun [countable]
[ Date: 1900-2000 ; Origin: hydro- + foil , on the model of airfoil ]
a large boat with wing-shaped parts on the bottom that lift it above the surface of the water when it travels fast ⇨ hovercraft