Definition of hydrofoil noun from the Oxford Advanced Learner's Dictionary

 

hydrofoil

 noun
noun
BrE BrE//ˈhaɪdrəfɔɪl//
 
; NAmE NAmE//ˈhaɪdrəfɔɪl//
 
Types of boats and ships
 
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a boat which rises above the surface of the water when it is travelling fast compare hovercraft See related entries: Types of boats and ships Word Origin 1920s: from hydro- ‘relating to water’, on the pattern of aerofoil.
See the Oxford Advanced American Dictionary entry: hydrofoil