Cathode (noun)

The electrode through which electrical current flows into a device or material, typically represented by a negative charge.

Origin:

The word cathode is derived from the greek word kathodos, which means way down, and refers to the electrode through which electrical current flows into a device or material.

Examples:

1. The cathode is negatively charged and the anode is positively charged.
2. Cathode rays are streams of electrons emitted from the cathode in a vacuum tube.
3. In a cathode ray tube, the cathode is the electron gun that emits electrons.
4. Cathode ray tubes are used in old televisions and computer monitors.
5. Cathodes can be made of different materials such as metals or semiconductors.