cathode
nounUK /ˈkæθəʊd/
US /ˈkæθoʊd/
The side of a battery or electric thing where power flows out.
The cathode is the positive end of the battery in this flashlight.
OTHER MEANINGS
2. In a vacuum tube, the part that gives off electrons when heated.
The heated cathode released electrons into the tube.
3. In electrolysis, the electrode where reduction happens and metal is deposited.
Copper built up on the cathode during electrolysis.
4. The negative terminal of a device that uses electricity, like a diode.
Current flows from the cathode to the anode in this diode.