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counter-ion

[koun-ter-ahy-uh n, -ahy-on] /ˈkaʊn tərˌaɪ ən, -ˌaɪ ɒn/
noun, Physical Chemistry
1.
an ion in solution that associates itself with an ion of opposite charge on the surface of a member of a solute.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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