thermonucléaire signifie anglais

thermonuclear▼◼◼◼(of, or relating to the fusion of atomic nuclei at high temperatures)
adjective
[UK: ˌθɜː.məʊ.ˈnjuː.klɪə(r)] [US: ˌθɜːmo.ʊ.ˈnjuː.klɪə(r)]