Anion:A negatively charged ion. Pronouncedan-I-on. Ananionis as opposed to a cation, which is a positively charged ion. From Women's Health Resources 14 Tips for Self-Care With Menopause Discussing Infertility with Your Doctor 7 Tricks to Help Improve Your Memory Featured Centers What Are the Best PsA Treatments for You? Understanding Biologics 10 Things People With Depression Wish You Knew Health SolutionsFrom Our Sponsors