1. Plural of hydrofoil; boats or ships equipped with wing-like structures that lift the hull above water to reduce drag and increase speed.
Usage: Commonly used in maritime and transportation contexts; Can refer to both the vessels themselves and the foil structures
2. The wing-like underwater appendages or structures attached to a vessel that generate lift to raise the hull above the water surface.
Usage: Technical/nautical usage; Often used in plural when referring to multiple foil structures on a single vessel

Examples

• The hydrofoils cut through the water at impressive speeds, barely touching the surface.
• Modern hydrofoils are used for high-speed passenger ferries in many coastal regions.
• The design of the hydrofoils allows the boat to travel faster than traditional hulls.
• Engineers tested new hydrofoils to improve fuel efficiency and reduce vibration.
• Several hydrofoils operate between the islands, providing quick transportation for commuters.
• The hydrofoils on the vessel lift it above the waves, creating a smoother ride.