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windmill

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windmill /ˈwɪndˌmɪl/ noun
plural windmills
windmill
/ˈwɪndˌmɪl/
noun
plural windmills
Learner's definition of WINDMILL
[count]
1 
: a structure that has parts which are turned around by the wind and that is used to produce power, pump water, etc.
2 
British : pinwheel 1

tilt at windmills

— see 1tilt