Definition from Wiktionary, the free dictionary
thermonuclear (not comparable)
- Of, or relating to the fusion of atomic nuclei at high temperatures.
- Of, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission.
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- The first thermonuclear reaction was in a star; it was brought about by heat, as the description implies. "Chances Of Power Station Use For Hydrogen Bomb", The Times, May 25 1956..