thermonuclear /ˌθɚmoʊˈnuːklijɚ/ Brit /ˌθəːməʊˈnjuːkliə/ adjective /ˌθɚmoʊˈnuːklijɚ/ Brit /ˌθəːməʊˈnjuːkliə/
adjective
Learner's definition of THERMONUCLEAR
technical
: of or relating to the changes in the nucleus of atoms that happen at extremely high temperatures热核的