[kat-ahy-uhn, -on]
noun Physical Chemistry.
a positively charged ion that is attracted to the cathode in electrolysis.
any positively charged atom or group of atoms (opposed to anion ).
Also, kation.

1825–35; < Greek katión going down (neuter of katiṓn, present participle of kateînai), equivalent to kat- cat- + -i- go + -on neuter present participle suffix

cationic [kat-ahy-on-ik] , adjective
cationically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cation (ˈkætaɪən)
Compare anion a positively charged ion; an ion that is attracted to the cathode during electrolysis
[C19: from cata- + ion]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1834, from Gk. kation "going down," neut. prp. of katienai "to go down," from kata "down."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cation cat·i·on (kāt'ī'ən)
An ion or group of ions having a positive charge and characteristically moving toward the negative electrode 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
cation   (kāt'ī'ən)  Pronunciation Key 
An ion with net positive charge, having more protons than electrons. In electrolysis, cations migrate to a negatively charged cathode. Compare anion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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