Cathode 2 topics · 2 sources ScienceEnergyThe negative pole or electrode of an electrolytic cell, vacuum tube, etc., where electrons enter (current leaves) the system; the opposite of an anode.US DOE Office of Energy Efficiency & Renewable Energy — Glossary of Energy-Related Terms retrieved 2014-05-26 Cite ScienceWaterThe negative pole or electrode of an electrolytic cell or system. The cathode attracts positively charged particles or ions (cations). See anode.Bureau of Reclamation — Bureau of Reclamation Glossary Cite