Magneto (noun)

A device that produces a magnetic field and is used to generate electrical current.

Origin:

Late latin magnetum 'magnet, loadstone' from greek magnētēs 'magnet'.

Examples:

1. The magneto in my car is faulty, that's why it won't start.
2. An old fashioned telephone used a hand-crank to generate power for the magneto.
3. An aircraft's magneto serves as an emergency backup in case the battery fails.
4. Magnetos are used in bicycles to power lights.
5. The magneto produces the high-voltage current needed to spark the engine's spark plugs.