Relating to or produced at the cathode; involving cathodic processes like electron emission or cathodic protection.
From 'cathode' plus the adjective suffix '-ic.' Used in electrochemistry and electrical engineering since the 19th century.
Cathodic protection is a brilliant engineering trick—you deliberately attach a piece of expendable metal to something you want to protect, and the cathode eats away instead of your valuable structure, preventing rust.
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