noun. A device that produces alternating current for distribution to the spark plugs, used in the ignition systems of some internal-combustion engines.

noun. Specifically, the electric generator used as the source of the current in internal-combustion motors (the engines of motor-cars in particular) to cause the spark which ignites the combustible mixture.

noun. A magneto-electric machine: as, a magneto-motor.

noun. A combining form of magnet or magnetic, often implying especially magneto-electric.

noun. 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.

noun. a dynamo that provides power to the spark plugs of a small internal combustion engine

noun. 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

"As the use of this instrument as a transmitter has practically ceased, the term magneto telephone has lost its significance as applying to the receiver, and, since many telephones are equipped with magneto generators for calling purposes, the term magneto telephone has, by common consent, come to be used to designate any telephone including, as a part of its equipment, a magneto generator."