hydrofoil
UK[ˈhaɪdrəfɔɪl]US[ˈhaɪdrəfɔɪl]
n
A wing-like structure attached to the hull of a boat that lifts it out of the water as it gains speed, reducing drag.
n
A boat equipped with such structures.
Morpheme Breakdown
hydro
foil
hydro
water
foil
thin sheet
Etymology
The word 'hydrofoil' is a modern scientific compound, directly constructed from classical roots to describe a 20th-century invention. The first element, 'hydro-', derives from the ancient Greek word for water, hydōr, a root pervasive in terms like 'hydrology' and 'hydrant'. The second element, 'foil', traces back to the Latin folium, meaning "leaf," which evolved to denote any thin, flat sheet or layer, as seen in 'aluminum foil'. Thus, a hydrofoil is, quite literally, a "water-leaf" – a streamlined, wing-like blade designed to operate within water, lifting a vessel's hull above the surface to dramatically increase its speed.
Analysis
Structure: hydro (water) + foil (thin sheet)
- hydro: From Greek hydōr (water). A combining form meaning "water" or "hydrogen."
- foil: From Latin folium (leaf). In this context, it refers to a thin, leaf-like structure or blade.
Examples
The ferry uses a hydrofoil to glide smoothly above the waves at high speed.
The engineer studied the angle of the hydrofoil to optimize its lift.
We took a hydrofoil across the bay, cutting the travel time in half.