anode

[an-ohd]
noun
1.
the electrode or terminal by which current enters an electrolytic cell, voltaic cell, battery, etc.
2.
the negative terminal of a voltaic cell or battery.
3.
the positive terminal, electrode, or element of an electron tube or electrolytic cell.

Origin:
1825–35; < Greek ánodos way up, equivalent to an- an-3 + hodós way, road

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anode (ˈænəʊd)
 
n
1.  the positive electrode in an electrolytic cell
2.  Also called (esp US): plate the positively charged electrode in an electronic valve
3.  Compare cathode the negative terminal of a primary cell
 
[C19: from Greek anodos a way up, from hodos a way; alluding to the movement of the current to or from the positive pole]
 
anodal
 
adj
 
anodic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

anode
1834, coined from Gk. anodos "way up," from ana "up" + hodos "way" (see cede). Proposed by the Rev. William Whewell (17941866), Eng. polymath, and published by Eng. chemist and physicist Michael Faraday (1791-1867). So called from the path the electrical current was thought
to take. Anodize is recorded from 1931.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
anode   (ān'ōd')  Pronunciation Key 
  1. The positive electrode in an electrolytic cell, toward which negatively charged particles are attracted. The anode has a positive charge because it is connected to the positively charged end of an external power supply.

  2. The positively charged element of an electrical device, such as a vacuum tube or a diode, to which electrons are attracted.

  3. The negative electrode of a voltaic cell, such as a battery. The anode gets its negative charge from the chemical reaction that happens inside the battery, not from an external source. Compare cathode.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Space-saving zinc-air power cells, for example, use air to activate a zinc
  anode.
Different materials for the anode and cathode, of course, affect this
  back-and-forth movement.
When a battery charges, energy moves between its cathode and anode.
These ions reach the anode and begin to oxidize the zinc--a reaction that
  produces current through the release of electrons.
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