nu·cle·ar fu·sion
noun/ˌnjuːkliə ˈfjuːʒn/
/ˌnuːkliər ˈfjuːʒn/
(also fusion)
[uncountable] (physics)- the act or process of combining the nuclei (= central parts) of atoms to form a heavier nucleus, with energy being released
核聚变；热核反应