SKIP TO CONTENT

dynamo

A dynamo creates energy. It’s short for "dynamoelectric machine," which is a generator that cranks out electric currents. If someone calls you a dynamo, don’t get mad, it just means you’re energetic.

The word dynamo comes from the Greek dynamis for "power." Boom! It’s like dynamite! The inventor of the dynamo-electric machine knew that when he named the device that turns mechanical power into electric current. Dynamos have been used to make power since the 1800’s. Since dynamo is such a snappy name, it’s often used to describe high-energy people, too. Is your room a disaster? Call an organizing dynamo to help you clean it up.

Definitions of dynamo
  1. noun
    generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature
    see moresee less
    type of:
    generator
    engine that converts mechanical energy into electrical energy by electromagnetic induction
  2. noun
    an alert and energetic person
    synonyms: busy bee, eager beaver, live wire, sharpie, sharpy
    see moresee less
    types:
    goffer, gopher
    a zealously energetic person (especially a salesman)
    type of:
    actor, doer, worker
    a person who acts and gets things done
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week

ACT

$29.95
  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week