n.
Pronunciation: ' h ī -dr ə - ˌ fo ̇ i(- ə )l
Function: noun
Date: 1919
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