Etymology
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magneto (n.)

1882, short for magneto-electric machine.

updated on November 18, 2018

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Definitions of magneto from WordNet

magneto (n.)
a small dynamo with a secondary winding that produces a high voltage enabling a spark to jump between the poles of a spark plug in a gasoline engine;
Synonyms: magnetoelectric machine
From wordnet.princeton.edu, not affiliated with etymonline.