Definition of dynamo in English:

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Pronunciation: /ˈdīnəˌmō/

noun (plural dynamos)

1A machine for converting mechanical energy into electrical energy; a generator.
Example sentences
  • A dynamo converts mechanical energy from a moving electrical conductor into electromagnetic energy and thus generates current.
  • Arguably the autocar laid the foundations for many of today's trains - using a petrol engine to drive a dynamo to power electric motors.
  • When he walks, the rotor of the dynamo rotates generating electricity and rechargeable batteries could be charged.
1.1 informal An extremely energetic person: she was a dynamo in London politics
More example sentences
  • The four organizers of Expozine are dynamos of productivity.
  • She was always a little dynamo, more than willing to jump in and lend a hand, always had a smile on her face.
  • She is an intellectual dynamo and long-time friend.


Late 19th century: abbreviation of dynamo-electric machine, from Greek dunamis 'power'.

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