cold cathode cold-catching • cold cereal · · · Info · Definitions · Characters · · cold cathode · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) a cathode that is a source of electrons without being heated. Synonyms: cold cathode. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C o latin small letter o U+006F t latin small letter t U+0074