Usually means: Nuclear fusion at extremely high temperatures.
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We found 26 dictionaries that define the word thermonuclear:

General (20 matching dictionaries)
  1. thermonuclear: Longman Dictionary of Contemporary English
  2. thermonuclear: Merriam-Webster
  3. thermonuclear: Oxford Learner's Dictionaries
  4. thermonuclear: American Heritage Dictionary of the English Language
  5. thermonuclear: Collins English Dictionary
  6. thermonuclear: Vocabulary.com
  7. Thermonuclear, thermonuclear: Wordnik
  8. thermonuclear: Wiktionary
  9. thermonuclear: Webster's New World College Dictionary, 4th Ed.
  10. thermonuclear: The Wordsmyth English Dictionary-Thesaurus
  11. thermonuclear: Infoplease Dictionary
  12. thermonuclear: Dictionary.com
  13. thermonuclear: Online Etymology Dictionary
  14. Thermonuclear: Wikipedia, the Free Encyclopedia
  15. thermonuclear: Rhymezone
  16. thermonuclear: FreeDictionary.org
  17. thermonuclear: Mnemonic Dictionary
  18. thermonuclear: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. thermonuclear: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. thermonuclear: Medical dictionary

Science (1 matching dictionary)
  1. Thermonuclear: NRC Glossary of Nuclear Terms --

Tech (2 matching dictionaries)
  1. thermonuclear: NATURAL RESOURCES DEFENSE COUNCIL
  2. DOD Dictionary of Military Terms (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Of, or relating to the fusion of atomic nuclei at high temperatures.
adjective:  Of, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission.
noun:  (military) A thermonuclear weapon.

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    fiery red,     radiant yellow,     neon green,     ultraviolet,     infrared, more...



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