adj. 1. having the character of an anion; negatively charged; containing anions; -- of atoms, molecules, and groups of atoms. Contrasted with cationic. [ PJC ]
2. of or pertaining to anions. Contrasted with cationic [ WordNet 1.5 ]
n. 1. a class of synthetic detergents in which the molecules do not ionize in aqueous solutions. Syn. --anionic detergent, non-ionic detergent [ WordNet 1.5 ]