Definition of watermill noun from the Oxford Advanced Learner's Dictionary

 

watermill

 noun
noun
BrE BrE//ˈwɔːtəmɪl//
 
; NAmE NAmE//ˈwɔːtərmɪl//
 
, NAmE//ˈwɑːtərmɪl//
 
 
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a mill next to a river in which the machinery for grinding grain into flour is driven by the power of the water turning a wheel
See the Oxford Advanced American Dictionary entry: watermill