Usually means: Electron emission without heating filament.
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We found 14 dictionaries that define the word cold cathode:

General (12 matching dictionaries)
  1. cold cathode: Merriam-Webster
  2. cold cathode: Oxford Learner's Dictionaries
  3. cold cathode: Collins English Dictionary
  4. cold cathode: Vocabulary.com
  5. cold-cathode: Wordnik
  6. cold-cathode, cold cathode: Wiktionary
  7. cold cathode: Infoplease Dictionary
  8. cold cathode: Dictionary.com
  9. Cold-cathode, Cold cathode: Wikipedia, the Free Encyclopedia
  10. cold cathode: FreeDictionary.org
  11. cold cathode: Mnemonic Dictionary
  12. cold cathode: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Cold-cathode, cold cathode: Encyclopedia

Tech (1 matching dictionary)
  1. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

Definitions from Wiktionary (cold cathode)

noun:  (electronics) A type of cathode that does not use a heating element to produce emission of cathode rays (electrons), beyond base thermionic emission (usually by field electron emission, secondary emission, photoelectric emission)

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