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armature

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armor.
Biology. the protective covering of an animal or plant, or any part serving for defense or offense.
Electricity.
1. the part of an electric machine that includes the main current-carrying winding and in which the electromotive force is induced.
2. the pivoted part of an electric device, as a buzzer or relay, that is activated by a magnetic field.
3. the iron or steel applied across the poles of a permanent magnet to close it, or across the poles of an electromagnet to transmit a mechanical force.
Sculpture. a skeletal framework built as a support on which a clay, wax, or plaster figure is constructed.

noun

a revolving structure in an electric motor or generator, wound with the coils that carry the current
any part of an electric machine or device that moves under the influence of a magnetic field or within which an electromotive force is induced
Also called: keeper a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit
such a bar placed across the poles of an electromagnet to transmit mechanical force
sculpture a framework to support the clay or other material used in modelling
the protective outer covering of an animal or plant
archaic armour

c.1400, “an armed force,” from Latin armatura “armor, equipment,” from armatus, past participle of armare “to arm, furnish with weapons” from arma (see arm (n.2)). Meaning “armor” is mid-15c.; that of “protective covering of a plant or animal” is from 1660s. Electromagnetic sense is from 1835.

The part of an electric motor or generator that consists of wire wound around an iron core and carries an electric current. In motors and generators using direct current, the armature rotates within a magnetic field; in motors and generators using alternating current a magnetic field is rotated about the armature.
A piece of soft iron connecting the poles of a magnet.
The part of an electromagnetic device, such as a relay or loudspeaker, that moves or vibrates.

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