counter-ion

[ koun-ter-ahy-uh n, -ahy-on ]
/ ˈkaʊn tərˌaɪ ən, -ˌaɪ ɒn /

noun Physical Chemistry.

an ion in solution that associates itself with an ion of opposite charge on the surface of a member of a solute.

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Origin of counter-ion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020