Definition of Cation

Cation: In chemistry, a positively charged ion. Pronounced cat-I-on.

A cation is as opposed to an anion, which is a negatively charged ion.


Last Editorial Review: 6/14/2012

Search MedTerms:


Back to MedTerms online medical dictionary A-Z List
Pill Identifier Tool

Need help identifying pills and medications?
Use the pill finder tool on RxList.