Definition of hydrofoil
1 : a body similar to an airfoil but designed for action in or on water
2 : a motorboat that has metal plates or fins attached by struts fore and aft for lifting the hull clear of the water as speed is attained
HYDROFOIL Defined for English Language Learners
Definition of hydrofoil for English Language Learners
: a very fast boat that rises partly out of the water when moving at high speeds
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