See more synonyms for dynamo on Thesaurus.com
noun, plural dy·na·mos.
  1. an electric generator, especially for direct current.
  2. an energetic, hardworking, forceful person.

Origin of dynamo

First recorded in 1882; short for dynamoelectric


  1. variant of dyna-: dynamometer.
Also dynam-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for dynamo

doer, pistol, generator, achiever, fireball

Examples from the Web for dynamo

Contemporary Examples of dynamo

Historical Examples of dynamo

  • His researches on the dynamo caused him to devise what he calls an 'harmonic engine.'

  • Here were the principles of the telegraph relay and the dynamo.

    The Age of Invention

    Holland Thompson

  • The product of the mechanical motion is electricity in the dynamo.

    The Machinery of the Universe

    Amos Emerson Dolbear

  • The ground carries the electricity back to the dynamo just as a wire would.

    Common Science

    Carleton W. Washburne

  • But no dynamo ever invented has the power that is centered in the dynamic will of a human being.

British Dictionary definitions for dynamo


noun plural -mos
  1. a device for converting mechanical energy into electrical energy, esp one that produces direct currentCompare generator (def. 1)
  2. informal an energetic hard-working person

Word Origin for dynamo

C19: short for dynamoelectric machine


sometimes before a vowel dynam-

combining form
  1. indicating powerdynamoelectric; dynamite

Word Origin for dynamo-

from Greek, from dunamis power
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for dynamo

1882, short for dynamo-machine, from German dynamoelektrischemaschine "dynamo-electric machine," coined 1867 by its inventor, German electrical engineer Werner Siemans (1816-1892), from Greek dynamis "power."

Online Etymology Dictionary, © 2010 Douglas Harper

dynamo in Medicine


  1. Force; energy:dynamogenesis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

dynamo in Science


  1. An electric generator, especially one that produces direct current. See more at generator.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.