A mill that is powered by the wind WordNet 3.0 & Open English WordNet

A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, by tradition specifically to mill grain, but in some parts of the English-speaking world the term has also been extended to encompass windpumps, wind turbines, and other applications. Wikipedia

Engine powered by the wind to produce energy. Wikipedia Disambiguation

Machine that converts the energy of wind into rotational energy Wikidata

A machine for grinding or pumping driven by a set of adjustable vanes or sails that are caused to turn by the force of the wind. OmegaWiki

A machine which translates linear motion of wind to rotational motion by means of adjustable vanes called sails. Wiktionary

Machine. Wiktionary (translation)