Definitions for "airfoil"
a surface such as the wing of an airplane designed to provide reactive force when in motion relative to the surrounding air.
A surface, such as an airplane wing, shaped to produce lift when moved through the air.
A part or surface, e.g., wing, prop blade, aileron, or rudder that's designed (shape, orientation etc.) to control the aircraft stability, direction, lift, thrust or propulsion.
a device that alters the air pressure around its surface, and in doing so causes a net force to act on the object
a device which gets a useful reaction from air moving over its surface
a structure designed to create a reaction upon its surface from the air through which it moves