Relating to or produced at a cathode, the negative electrode in an electrical device.
From cathode (from Greek kathodos 'way down') + -ical suffix meaning 'relating to.' The term emerged in 19th-century electrochemistry to describe phenomena occurring at the negative terminal.
Cathodical reactions are happening right now in your phone's battery—the cathode is where electrons are released, making your device work. Scientists use cathodical properties to create glowing screens and analyze metal surfaces.
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