cation: Meaning and Definition of
cat•i•on
Pronunciation: (kat'ī"un, -on), [key] — n. Physical Chem.
- a positively charged ion that is attracted to the cathode in electrolysis.
- any positively charged atom or group of atoms (opposed to anion).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.