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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 ?
Radtke says Wind Mill worked with Boise and Amerhart to develop the core, which he claims is approximately 50 percent stronger than traditional MDF.
It is to be mentioned here that Turkish Ambassador to Pakistan, Mustafa Babur Hizlan who met the Prime Minister on last Friday had told him that the Wind Mill Project was ready for energization.
Wind Mill Woodworking of Sheboygan Falls, WI, grew its slatwall and component business from $2.
Short term solutions like wind mill and solar power projects, can only be successful along the coastal areas and per unit cost is expensive", they deliberated saying more the only viable short term solution to get rid of energy crisis is solar power system that takes less time to install and can be customized according to the requirement, while Pakistan's climate quite favours the solar system due to the availability of solar light throughout the year.
In the initial phase, China Wind Systems will focus on producing rolled rings that measure up to 5 meters in diameter as well as other wind mill components such as yaw bearings, shafts and rotor blades.
The interviewee is unnerved: "The government could put some money into putting seagulls' nests on every wind mill and we would get rid of the seagull c*** we have everywhere in Llandudno.
This well is among the initial eight wells on our Koppers South Prospect that were drilled in the joint venture of Wind Mill Oil and Gas, LLC.
Entering its third decade, Wind Mill Woodworking redefines not only its manufacturing operations but its business as well.
The only working wind mill in Wales is an agricultural museum producing stone ground whole meal flour for sale using organic wheat
This well is among the first successful commercial gas wells in the Koppers South program through its joint venture Wind Mill Oil & Gas, LLC.
After being towed in a horizontal position to the moyfjoden fjord in Norway, the substructure was up-ended and stabilized before assembly with the wind mill, including the generator and the turbine blades.
BULLETIN BOARD: MILL) announced today the successful drilling of the third commercial gas well in the Koppers South drilling program through its joint venture Wind Mill Oil & Gas, LLC.