Biology. the protective covering of an animal or plant, or any part serving for defense or offense.
the part of an electric machine that includes the main current-carrying winding and in which the electromotive force is induced.
the pivoted part of an electric device, as a buzzer or relay, that is activated by a magnetic field.
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. See illus. under electromagnet.
Sculpture. a skeletal framework built as a support on which a clay, wax, or plaster figure is constructed.

1535–45; (< Middle French) < Latin armātūra an outfit, armor, equivalent to armāt(us) equipped (see arm2, -ate1) + -ūra -ure

amateur, armature. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
armature (ˈɑːmətjʊə)
1.  a revolving structure in an electric motor or generator, wound with the coils that carry the current
2.  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
3.  Also called: keeper a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit
4.  such a bar placed across the poles of an electromagnet to transmit mechanical force
5.  sculpture a framework to support the clay or other material used in modelling
6.  the protective outer covering of an animal or plant
7.  archaic armour
[C15: from Latin armātūra armour, equipment, from armāre to furnish with equipment; see arm²]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1835, from L. armatura "armor," from armatus, pp. of armare "to arm, furnish with weapons" from arma (see arm (2)). Electromagnetic sense is from 1835.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
armature   (är'mə-chər)  Pronunciation Key 
  1. 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.

  2. A piece of soft iron connecting the poles of a magnet.

  3. The part of an electromagnetic device, such as a relay or loudspeaker, that moves or vibrates.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The hand-wound armature is the size of an ankle shackle, built to last
There he began by sculpting clay applied to a wooden armature.
Generators had a ball bearing on one end of the armature and a bushing on the
  other end.
The basic dc motor loop circuit consists of a dc motor armature in series with
  a dc power supply.
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