dynamo

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˈdaɪnəməʊ/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈdaɪnəˌmoʊ/ ,USA pronunciation: respelling(dīnə mō′)

Inflections of 'dynamo' (n): npl: dynamos

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-. 
Collins Concise English Dictionary © HarperCollins Publishers::
dynamo /ˈdaɪnəˌməʊ/ n ( pl -mos)
  1. a device for converting mechanical energy into electrical energy, esp one that produces direct current
    Compare generator
  2. informal an energetic hard-working person
Etymology: 19th Century: short for dynamoelectric machine
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
'dynamo' also found in these entries (note: many are not synonyms or translations):

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