electrode that is not directly connected to the power supply but is so placed in the solution between the anode and the cathode that the part nearest to the anode becomes cathodic and the part nearest to cathode becomes anodic, elektrood, mis ei ole vahetult ühendatud toiteallikaga, kuid on paigutatud elektrolüüti anoodi ja katoodi vahele nii, et anoodile lähemal olev pind toimib katoodina ning katoodile lähemal olev pind toimib anoodina