What does aerofoil mean?
An aerofoil is any surface shaped so that air flowing over it produces lift, making it the fundamental principle behind flight. Wings, propeller blades, rotor blades, and turbine blades are all aerofoils, each with a characteristic cross-sectional profile — typically rounded at the leading edge and tapered toward the trailing edge. The term also refers to that cross-sectional shape itself, which engineers analyse and refine in aerodynamics. In British English it is spelled 'aerofoil', while American English uses 'airfoil'; the two words denote exactly the same concept. Though chiefly a technical term found in aviation, engineering, and motorsport contexts, the underlying idea appears in everyday life, from ceiling fans to Formula One cars, where inverted aerofoils push vehicles down rather than up. Understanding the word offers a window into how humanity learned to fly.
nounA curved surface, such as a wing or blade, designed to generate lift or thrust when air flows over it. The term is the standard British name for what is called an 'airfoil' in American English.
- A shaped surface (such as a wing, rotor blade, or propeller) that generates lift when air moves across it.
- The specific cross-sectional profile or shape of such a surface, as studied in aerodynamics.
"The aircraft's aerofoil was carefully shaped to maximise lift while minimising drag."
"Engineers tested dozens of aerofoil sections before settling on the final wing design."
"In Formula One, cars use inverted aerofoils to press them down onto the track at high speed."
Standard regular plural; used when referring to multiple lifting surfaces, such as those on multi-element wings or turbine assemblies.
"Modern wind turbines rely on precisely engineered aerofoils to extract energy efficiently."
Every aeroplane wing, helicopter rotor, and even some racing car spoilers are aerofoils — the same curved shape that keeps 400 tonnes of metal in the sky.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aerofoil
The word combines 'aero-', from Greek 'aēr' meaning air, with 'foil', from Latin 'folium' meaning leaf — so an aerofoil is literally an 'air leaf', evoking the thin, leaf-like shape of a wing section. It emerged in the late nineteenth and early twentieth centuries alongside the birth of powered flight, when pioneers needed precise vocabulary for wing shapes. Its Greek root 'aēr' also underlies cognates such as 'aeroplane', 'aerial', and 'aeronautics', all describing things connected with the air.
How aerofoil is actually used
Primarily technical, used in aviation, engineering, and physics contexts. 'Aerofoil' is standard in British English; American English uses 'airfoil'. The word carries no strong connotation — it is neutral and precise.
Easily confused with aerofoil
'Airfoil' is simply the American English equivalent of 'aerofoil'; both refer to the same shape, but spelling and usage differ by region.
A hydrofoil is a foil designed to generate lift in water rather than in air, used on boats to raise the hull above the surface.