Pronunciation: (kath'ōd), [key]
1. the electrode or terminal by which current leaves an electrolytic cell, voltaic cell, battery, etc.
2. the positive terminal of a voltaic cell or battery.
3. the negative terminal, electrode, or element of an electron tube or electrolytic cell.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.