counterion

noun
coun·​ter·​ion | \ ˈkau̇n-tər-ˌī-ən How to pronounce counterion (audio) , -ˌän\

Definition of counterion

: an ion having a charge opposite to that of the substance with which it is associated

First Known Use of counterion

1940, in the meaning defined above

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The first known use of counterion was in 1940

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