The Collaborative International Dictionary of English v.0.48:
cationic \cationic\ adj. (Chem.) of or pertaining to cations; having a net positive charge; positively ionic; -- said of ions. Contrasted with anionic. [WordNet 1.5]WordNet (r) 3.0 (2006):
cationic adj 1: of or relating to cations [ant: anionic]