An Etymological Dictionary of Astronomy and Astrophysics
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A negatively charged electrode that is the source of electrons in an electrical device.

Gk. kathodos "descent, a way down," from kata- "down" + hodos "way, path."

A kind of ray generated at the cathode in a vacuum tube, by the electrical discharge.

→ cathode; →ray.

Electrode capable of releasing electrons when illuminated.

→ photo- + → cathode.