nuclear fusion
US /ˌnuː.klɪər ˈfjuː.ʒən/
UK /ˌnuː.klɪər ˈfjuː.ʒən/

1.
fusion nucléaire
a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
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Scientists are working to harness nuclear fusion as a clean energy source.
Les scientifiques travaillent à exploiter la fusion nucléaire comme source d'énergie propre.
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The sun's energy is produced through nuclear fusion.
L'énergie du soleil est produite par la fusion nucléaire.