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Windmill, machine that performs work by harnessing wind power. In the traditional windmill the power applied to a horizontal shaft by 4 large radiating sails is transmitted to milling or pumping machinery housed in a sizable supporting structure. The windmill's modern counterpart is the wind turbine, often seen in rural areas. Here a multibladed turbine wheel mounted on a steel derrick or mast and pointed into the wind by a fantail drives a pump or electric generator.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Willamette River to Yaoundé