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ar·ma·ture
n. - Electricity.
- The rotating part of a dynamo, consisting essentially of copper wire wound around an iron core.
- The moving part of an electromagnetic device such as a relay, buzzer, or loudspeaker.
- A piece of soft iron connecting the poles of a magnet.
http://dictionary.reference.com/search?q=armature
armature:
(fís.) armadura (de una dinamo, en la botella de Leiden etc.).