The Collaborative International Dictionary
cationic
cationic \cationic\ adj. (Chem.) of or pertaining to cations; having a net positive charge; positively ionic; -- said of ions. Contrasted with anionic.
Wiktionary
cationic
a. (context chemistry English) of, relating to, or being a cation
WordNet
cationic
adj. of or relating to cations [ant: anionic]