a rectifier consisting of laminated plates of metal, usually iron, that have been coated with selenium on one side, with rectification taking place because the flow of electrons from the conductive metal to the selenium occurs more readily than the flow in the opposite direction.
SELENIUM RECTIFIER
Meaning of SELENIUM RECTIFIER in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012