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apparatus that harnesses wind power for a variety of uses, e.g., pumping water, grinding corn, driving small sawmills, and driving electrical generators. Windmills were probably not known in Europe before the 12th cent., but thereafter they became familiar landmarks in Holland, England, France, and Germany. The typical Dutch windmill, also called the tower type, has a huge tower of stone, brick, or wood, in contrast to the German, or post, mill, the distinctive feature of which is that the whole building revolves on a central post. At the top of either type there is a revolving apparatus to which four to six arms are attached. The arms, usually 20 to 40 ft (6–12 m) long, bear sails constructed of light wood, or of canvas attached to a frame. A small fan serves as a rudder to keep the wheel facing the wind.

More modern American windmills have high towers of light steel girders; at the top is a wheel with many sheet-metal concave and "warped" vanes (sails) about 4 ft (1.2 m) long. The wheel is kept automatically facing the wind by a broad tail geared to a shaft. They have been widely used for pumping water in rural parts of the United States. Such windmills can also be used to generate about one kilowatt of elecricity.

Larger windmills, such as the modern propellerlike wind turbines, can have rotors (the blade assembly) that span 200 ft (60 m) or more. These wind turbines, often joined together in wind farms, can produce 1.5 MW or more of electricity and can serve as a significant source of electric energy in plains and coastal areas (including offshore locations). Wind turbines have been most extensively used in Europe, where Denmark, for example, is undertaking to generate 50% of its electricty using wind power by 2030. By 2013, wind turbines represented 13% of the installed power capacity in the European Union. Thousands of small wind turbines are used in Inner Mongolia to provide local electric power to nomadic people.


A tower structure with wind-powered vanes connected by a rotating shaft to a pump or generator for pumping water and generating electricity.


(mechanical engineering)
Any of various mechanisms, such as a mill, pump, or electric generator, operated by the force of wind against vanes or sails radiating about a horizontal shaft.


A large machine in which the wind acts on a number of vanes or blades, rotating them about an axis, thereby producing mechanical power; once widely used for grinding grain, sawing timber, and pumping water. The earliest windmills in America (similar to those in the Netherlands) had four very large, slowly moving blades that were cloth-covered, and required the constant attendance of an operator. In 1854, a patent was issued for an entirely new type of windmill, having a large number of small blades, which was self-regulating and could operate without human intervention; this feature greatly increased its practical application, especially for pumping water. In the latter part of the 20th century, large two-bladed windmills have been assembled in large groups called “farms” for the environment-friendly generation of electrical power.


1. 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
2. the set of vanes or sails that drives such a mill
3. Brit a toy consisting of plastic or paper vanes attached to a stick in such a manner that they revolve like the sails of a windmill
4. a small air-driven propeller fitted to a light aircraft to drive auxiliary equipment
References in periodicals archive ?
The oldest of the pair was at Windmill Pointe, located at the head of the Detroit River near what is today Mariner Park in the town of Grosse Pointe Park.
Split Rock Creek runs through the couple's property; the Rodmans placed the windmill nearby.
The sails had been off the windmill for over 120 years and the building was totally empty inside.
This room contains a shaft for the windmill sails and provides access to a further wooden balcony running around the perimeter of the windmill.
I'm looking forward to seeing the finished windmill - once complete it will be a lovely centrepiece at the park.
The Georgian windmill reopened to the public last year after a five-year restoration project, but this will be the first time the sails have turned since 1948.
The mill, in Windmill Lane, Balsall Common, will be open from 12pm to 4pm.
Batavia's windmills, which incorporated innovative design ideas for the blades and wheels, were used to pump water for livestock and plants and also played a major role in western expansion, allowing settlements to grow beyond the confines of lakes and rivers.
RESTING: Marion Fergie's friend WRECKED: Wavertree Windmill in ruins
In 1854, Daniel Halladay, a Vermont-born engineer, designed a new type of windmill for pumping water.
Windmill Inn of Roseburg will retain their name, but the hotel itself will soon be undergoing a refurbishment.