anion

[an-ahy-uhn]
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:
1825–35; < Greek, neuter of aniṓn going up (present participle of aniénai to go up), equivalent to an- an-3 + -i- go + -ōn present participle suffix

anionic [an-ahy-on-ik] , adjective
anionically, adverb
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World English Dictionary
anion (ˈænˌaɪən)
 
n
Compare cation a negatively charged ion; an ion that is attracted to the anode during electrolysis
 
[C19: from ana- + ion]
 
anionic
 
adj

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

anion
"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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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
anion   (ān'ī'ən)  Pronunciation Key 
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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Example sentences for anionic
It is an anionic dye, which binds with proteins nonspecifically.
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