Etymology
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windmill (n.)

c. 1300, from wind (n.1) + mill (n.). Similar formation in German Windmühle, Dutch windmolen, French moulin à vent. Verb meaning "to swing the arms wildly" is recorded from 1888. Related: Windmilled; windmilling.

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Definitions of windmill

windmill (n.)
a mill that is powered by the wind;
windmill (n.)
generator that extracts usable energy from winds;
Synonyms: aerogenerator / wind generator
From wordnet.princeton.edu