magneto(n = noun.artifact) magnetoelectric machine - 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;
A small electric generator with an armature rotating in a magnetic field, having a secondary winding that generates a high voltage, such as one used to generate a voltage sufficient to cause a spark to jump between the poles of a spark plug in an internal-combustion engine. [WordNet 1.5]
magneto, n. (pl. -os) an electric generator using permanent magnets and producing high voltage, esp. for the ignition of an internal-combustion engine.
Etymology
abbr. of MAGNETO-ELECTRIC
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