Meaning of anion

an•i•on

Pronunciation: (an'ī"un), [key]
— n. Physical Chem.
  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).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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