Collins Concise English Dictionary © HarperCollins Publishers::
dynamo-, (sometimes before a vowel) dynam- combining form
  1. indicating power: dynamoelectric, dynamite
Etymology: from Greek, from dunamis power
WordReference Random House Learner's Dictionary of American English © 2026
dy•na•mo /ˈdaɪnəˌmoʊ/USA pronunciation   n. [countable], pl. -mos. 
  1. Electricityan electric generator, esp. for direct current.
  2. an energetic, forceful person:She's a real dynamo.
See -dyn-.
WordReference Random House Unabridged Dictionary of American English © 2026
dy•na•mo  (dīnə mō′),USA pronunciation n., pl. -mos. 
  1. Electricityan electric generator, esp. for direct current.
  2. an energetic, hardworking, forceful person.
  • short for dynamoelectric 1882

dynamo-, 
  1. var. of dyna-: dynamometer.
Also, dynam-. 
'dynamo-' also found in these entries (note: many are not synonyms or translations):

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