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

     

    dynamo

     noun
    noun
    BrE BrE//ˈdaɪnəməʊ//
     
    ; NAmE NAmE//ˈdaɪnəmoʊ//
     
    (pl. dynamos) How machines work, Devices
     
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  1. 1 a device for turning mechanical energy (= energy from movement) into electricity; a generator See related entries: How machines work, Devices
  2. 2(informal) a person with a lot of energy the team’s midfield dynamo She's a human dynamo.
  3. Word Origin late 19th cent.: abbreviation of dynamo-electric machine, from Greek dunamis ‘power’.
See the Oxford Advanced American Dictionary entry: dynamo