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hydrofoil

hy·dro·foil [ hdrə fòyl ] (plural hy·dro·foils)


noun 
Definition:
 
1. high-speed boat: a boat with wing-shaped blades attached to struts under the hull that lift the boat out of the water as the speed increases

2. blade on hydrofoil: a wing-shaped blade that lifts a hydrofoil out of the water

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