electrode

[ih-lek-trohd]
noun Electricity.
a conductor, not necessarily metallic, through which a current enters or leaves a nonmetallic medium, as an electrolytic cell, arc generator, vacuum tube, or gaseous discharge tube.

Origin:
1825–35; electr- + -ode2

interelectrode, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
electrode (ɪˈlɛktrəʊd)
 
n
1.  a conductor through which an electric current enters or leaves an electrolyte, an electric arc, or an electronic valve or tube
2.  an element in a semiconducting device that emits, collects, or controls the movement of electrons or holes

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Etymonline
Word Origin & History

electrode
1834, coined by Eng. physicist and chemist Michael Faraday (1791-1867) from electro- (see electric) + Gk. hodos "way" (see cede).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

electrode e·lec·trode (ĭ-lěk'trōd')
n.

  1. A solid electric conductor through which an electric current enters or leaves an electrolytic cell or other medium.

  2. A collector or emitter of electric charge or of electric-charge carriers, as in a semiconducting device.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
electrode   (ĭ-lěk'trōd')  Pronunciation Key 
A conductor through which an electric current enters or leaves a substance (or a vacuum) whose electrical characteristics are being measured, used, or manipulated. Electrodes can be used to detect electrical activity such as brain waves. Terminal points in electrical components such as transistors, diodes, and batteries are electrodes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The electrode is not touching a point critical to language.
When muscles contract, they give off an electrical burst strong enough to be
  detected by an electrode placed on the skin.
The electrode is wrapped around the insect's auditory nerve.
Apply the opposite charge and the electrode flips back, breaking the circuit.
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