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English definition of “dynamo”

dynamo

noun uk   /ˈdaɪ.nə.məʊ/ us    /-moʊ/ (plural dynamos)
[C] a device that changes energy of movement into electrical energy: A dynamo on a bicycle will power a pair of lights while the wheels are going round. [C usually singular] an energetic force: Onstage she is a human dynamo, spending the hour in perpetual motion.
(Definition of dynamo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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