hydrofoil

英 ['haɪdrə(ʊ)fɒɪl] 美['haɪdrəfɔɪl]

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"

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"