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

dynamo

noun
 
/ˈdaɪnəməʊ/
 
/ˈdaɪnəməʊ/
(plural dynamos)
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  1. a device for turning mechanical energy (= energy from movement) into electricity; a generatorTopics Engineeringc2
  2. (informal) a person with a lot of energy
    • the team’s midfield dynamo
    • She's a human dynamo.
    3. Word Originlate 19th cent.: abbreviation of dynamo-electric machine, from Greek dunamis ‘power’.
See dynamo in the Oxford Advanced American Dictionary
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