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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Armature \Ar"ma*ture\, noun [L. armatura, fr. armare to arm: cf. F. armature. See {Arm}, verb (used with an object), {Armor}.]
1. Armor; whatever is worn or used for the protection and defense of the body, esp. the protective outfit of some animals and plants.
2. (Magnetism) A piece of soft iron used to connect the two poles of a magnet, or electro-magnet, in order to complete the circuit, or to receive and apply the magnetic force. In the ordinary horseshoe magnet, it serves to prevent the dissipation of the magnetic force.
3. (Arch.) Iron bars or framing employed for the consolidation of a building, as in sustaining slender columns, holding up canopies, etc. --Oxf. Gloss.
4. (Elec.) That moving part of a dynamo or electric generator in which a current is induced by a moving through a magnetic field, or, in an electric motor, the part through which the applied current moves, thereby generating torque. The armature usually consists of a series of coils or groups of insulated conductors surrounding a core of iron. [Webster 1913 Suppl.]
From WordNet (r) 2.0 [wn]:
armature
noun: coil in which voltage is induced by motion through a magnetic field
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