nuclear fusion
noun🔊/ˌnjuːkliə ˈfjuːʒn/
🔊/ˌnuːkliər ˈfjuːʒn/
(also fusion)
[uncountable] (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