Airscrew. All. types of screws with helical blades designed to rotate in air and more particularly power-driven screws designed to produce thrust by rotation. Synonymous with the term 'propeller'.
AIRSCREW - Now little-used word for propeller; believed to have originated to provide distinction from ship's propeller.
AIRSHIP - A powered lighter-than-air craft.
A windmill is basically an airscrew or propeller working in reverse, such that the air flowing over the sails is deflected by them, and exerts a force on the sails pushing them around.
Glauert H., The Elements of Aerofoil and Airscrew Theory, Chapter 2, Cambridge University Press, 1947
Liepmann H. W. and A. E. Pucket, Introduction to Aerodynamics of a Compressible Fluid, John Wiley and Sons, Inc. 1947
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As the blades of the propeller turned, in addition to screwing into the air and moving it to the rear (from which the other name for a propeller-"airscrew"-derives), ...
 See also: Flight, Plane, Aircraft, Direct, Aviation
  
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