Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: dynamoelectric machine (1800-1900)

dynamo

 noun
     
Related topics: Electricity, Electricity, Tools
dy‧na‧mo plural dynamos [countable]
1TPE a machine that changes some other form of power directly into electricity:
bicycle lights powered by a dynamo
2 someone who is excited about what they do and who puts a lot of energy into it:
the team's midfield dynamo
3 something that has a strong effect on something else, and that makes things happen:
Oil is the dynamo of the country's economy.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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