Webster's English Dictionary

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windmill

1. wind.mill \'win(d)-.mil\ n [fr. the episode in Don Quixote by Cervantes 
   in which the hero attacks wi] 1a: a mill operated by the wind usu. acting 
   on oblique vanes or sails which  radiate from a horizontal shaft; esp : a 
   wind-driven water pump 1b: the wind-driven wheel of a windmill  2: 
   something that resembles or suggests a windmill : as  2a: PINWHEEL  slang  
   2b: HELICOPTER ndmills under the illusion that they are giants 3: an 
   imaginary wrong, evil, or opponent - used in the phrase to tilt  at 
   windmills
2. windmill vt : to cause to move like a windmill to move like a windmill