Definition of dynamo noun from the Oxford Advanced American Dictionary

     

    dynamo

     noun
    noun
    NAmE//ˈdaɪnəmoʊ//
     
    (pl. dynamos)
     
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  1. 1a device for turning mechanical energy (= energy from movement) into electricity; a generator
  2. 2(informal) a person with a lot of energy the team's midfield dynamo She's a human dynamo.
See the Oxford Advanced Learner's Dictionary entry: dynamo