windmill

n. device which harnesses the power of the wind by means of large blades which rotate around a shaft from the force of the wind (especially used to pump water, power a millhouse, or generate electricity)

A windmill is a machine designed to convert the energy of the wind into more useful forms using rotating blades. The term also refers to the structure it is commonly built on. In much of Europe, windmills served to grind grain, later applications include pumping water.
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Noun
1. a mill that is powered by the wind
(hypernym) mill, grinder
2. generator that extracts usable energy from winds
(synonym) aerogenerator, wind generator
(hypernym) generator
(part-meronym) blade, vane

(n.)
A mill operated by the power of the wind, usually by the action of the wind upon oblique vanes or sails which radiate from a horizontal shaft.
  

To see a windmill in operation in your dreams, foretells abundant accumulation of fortune and marked contentment

To see one broken or idle, signifies adversity coming unawares.