Definition of dynamo in English:


Line breaks: dy¦namo
Pronunciation: /ˈdʌɪnəməʊ

noun (plural dynamos)

chiefly British
  • 1A machine for converting mechanical energy into electrical energy, typically by means of rotating coils of copper wire in a magnetic field.
    More 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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