Definition of thermonuclear adjective from the Oxford Advanced Learner's Dictionary

 

thermonuclear

 adjective
adjective
BrE BrE//ˌθɜːməʊˈnjuːkliə(r)//
 
; NAmE NAmE//ˌθɜːrmoʊˈnuːkliər//
 
 
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connected with nuclear reactions that only happen at very high temperatures a thermonuclear reaction
See the Oxford Advanced American Dictionary entry: thermonuclear