dynamo

Etymology

A shortening of dynamo-electric machine. The element dynamo- is ultimately from Ancient Greek δύναμις (dúnamis, “power”).

noun

  1. (electromagnetism) An electricity generator; a dynamo-electric machine.
  2. (astrophysics) The mechanism by which a celestial body, such as the Earth or a star, generates a magnetic field.
  3. (figurative) An energetic person.
    That new Vice President of Marketing is a real dynamo; sales have already gone up this quarter.

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