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[an-ahy-uh n] /ˈænˌaɪ ən/
noun, Physical Chemistry
a negatively charged ion, as one attracted to the anode in electrolysis.
any negatively charged atom or group of atoms (opposed to cation).
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
[an-ahy-on-ik] /ˌæn aɪˈɒn ɪk/ (Show IPA),
anionically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for anionic
  • It is an anionic dye, which binds with proteins nonspecifically.
British Dictionary definitions for anionic


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
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Word Origin and History for anionic
"a negatively charged ion, which moves toward the anode (q.v.) during electrolysis," 1834, proposed by the Rev. William Whewell (17941866), Eng. polymath, and published by Eng. physicist Michael Faraday from Gk. anion "(thing) going up," neut. pp. of anienai "go up," from ana "up" + ienai "go" (see ion).
Online Etymology Dictionary, © 2010 Douglas Harper
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anionic in Medicine

anion an·i·on (ān'ī'ən)
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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anionic in Science
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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