noun, plural dynamos.
an electric generator, especially for direct current.
an energetic, hardworking, forceful person.

1882; short for dynamoelectric

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variant of dyna-: dynamometer.
Also, dynam-.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dynamo (ˈdaɪnəˌməʊ)
n , pl -mos
1.  Compare generator a device for converting mechanical energy into electrical energy, esp one that produces direct current
2.  informal an energetic hard-working person
[C19: short for dynamoelectric machine]

dynamo- or (sometimes before a vowel) dynam-
combining form
indicating power: dynamoelectric; dynamite
[from Greek, from dunamis power]
dynam- or (sometimes before a vowel) dynam-
combining form
[from Greek, from dunamis power]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1882, short for Ger. dynamoelektrischemaschine, coined 1867 by its inventor, Ger. electrical engineer Werner Siemans (1816-92), from Gk. dynamis "power."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dynamo- pref.
force; energy: dynamogenesis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dynamo   (dī'nə-mō')  Pronunciation Key 
An electric generator, especially one that produces direct current. See more at generator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

DYNAMO definition

DYNamic MOdels. A language for continuous simulation including economic, industrial and social systems, developed by Phyllis Fox and A.L. Pugh in 1959.
Versions include DYNAMO II, DYNAMO II/370, DYNAMO II/F, DYNAMO III and Gaming DYNAMO.
["DYNAMO User's Manual", A.L. Pugh, MIT Press 1976].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Power carried by wire from a neighboring electric, switch set the wheels in
  this dynamo whirring.
Only when he tried to back-cast did he find himself hooked into a living,
  breathing dynamo.
The variation must presumably arise from small changes in either of the two
  processes which give the dynamo action, or both.
The alarm increased when partial darkness resulted from repairs to the dynamo
  which were going on in the cellar.
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