cath·odeBrE/ˈkæθəʊd/NAmE/ˈkæθoʊd/noun (specialist) theelectrode in an electrical device where reduction occurs; the negative cell and the positive electrode cell and the positive electrodeinanelectrolyticcellandthepositiveelectrodeinabattery阴极;(电解池的)负极;(原电池的)正极➡ compareanode