| anion acid acidity agent alkali alkalinity alloisomer antacid atom base |
| Anion (n.) An electro-negative element, or the element which, in electro-chemical decompositions, is evolved at the anode |
| anion | a negatively charged ion |
| superoxide superoxide anion | the univalent anion O-, much of the O supporting cellular respiration is reduced to the superoxide anion O- |