Usually means: Study of electron emission, heat.
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We found 14 dictionaries that define the word thermionics:

General (13 matching dictionaries)
  1. thermionics: Merriam-Webster
  2. thermionics: Oxford Learner's Dictionaries
  3. thermionics: American Heritage Dictionary of the English Language
  4. thermionics: Collins English Dictionary
  5. thermionics: Vocabulary.com
  6. thermionics: Wiktionary
  7. thermionics: Webster's New World College Dictionary, 4th Ed.
  8. thermionics: Infoplease Dictionary
  9. thermionics: Dictionary.com
  10. thermionics: Rhymezone
  11. thermionics: FreeDictionary.org
  12. thermionics: Mnemonic Dictionary
  13. thermionics: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. thermionics: Encyclopedia

(Note: See thermionic as well.)

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Definitions from Wiktionary (thermionics)

▸ noun:  The science dealing with thermionic emission.

Similar:
thermoelectronics, thermion, thermoelectron, thermoelectrics, thermosonimetry, thermoelectricity, thermoelectrometry, thermomechanics, thermal imaging, caloritronics, more...

Opposite:
cryogenics, refrigeration, cooling

Types:
semiconductor, superconductor, insulator, metal, more...

▸ Words similar to thermionics

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Similar:
thermoelectronics, thermion, thermoelectron, thermoelectrics, thermosonimetry, thermoelectricity, thermoelectrometry, thermomechanics, thermal imaging, caloritronics, more...

Opposite:
cryogenics, refrigeration, cooling

Types:
semiconductor, superconductor, insulator, metal, more...



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