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anion

[an-ahy-uh n] /ˈænˌaɪ ən/
noun, Physical Chemistry
1.
a negatively charged ion, as one attracted to the anode in electrolysis.
2.
any negatively charged atom or group of atoms (opposed to cation).
Origin
1825-1835
1825-35; < Greek, neuter of aniṓn going up (present participle of aniénai to go up), equivalent to an- an-3 + -i- go + -ōn present participle suffix
Related forms
anionic
[an-ahy-on-ik] /ˌæn aɪˈɒn ɪk/ (Show IPA),
adjective
anionically, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anion

anion

/ˈænˌaɪən/
noun
1.
a negatively charged ion; an ion that is attracted to the anode during electrolysis Compare cation
Derived Forms
anionic (ˌænaɪˈɒnɪk) adjective
Word Origin
C19: from ana- + ion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for anion
n.

"a negatively charged ion, which moves toward the anode (q.v.) during electrolysis," 1834, proposed by the Rev. William Whewell (1794-1866), English polymath, and published by English physicist Michael Faraday, from Greek anion "(thing) going up," neuter past participle of anienai "go up," from ana "up" (see ana-) + ienai "go" (see ion).

Online Etymology Dictionary, © 2010 Douglas Harper
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anion in Medicine

anion an·i·on (ān'ī'ən)
n.
A negatively charged ion, especially one that migrates to the anode in electrolysis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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anion in Science
anion
  (ān'ī'ən)   
An ion with net negative charge, having more electrons than protons. In electrolysis, anions migrate to a positively charged anode. Compare cation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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