ther‧mo‧nu‧cle‧ar /ˌθɜːməʊˈnjuːkliə◂ $ ˌθɜːrmoʊˈnuːkliər◂/ adjective
thermonuclear weapons use a nuclear reaction, involving the splitting of atoms, to produce very high temperatures and a very powerful explosion:
a thermonuclear device

[TahlilGaran] Dictionary of Contemporary English ▲