cath·ode noun \ˈkath-ˌōd\
: the electrode of an electrochemical cell at which reduction occurs: as a : the negative terminal of an electrolytic cell b : the positive terminal of a storage battery that is delivering current
: the electron-emitting electrode of an electron tube—compare anode
Seen & Heard
What made you want to look up cathode? Please tell us where you read or heard it (including the quote, if possible).