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nuclear

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nuclear/ˈnuːklijɚ/
British/ˈnjuːklijə/adjective
nuclear
/ˈnuːklijɚ/British/ˈnjuːklijə/
adjective
Learner's definition of NUCLEAR  
always used before a noun
: of, relating to, producing, or using energy that is created when the nuclei of atoms are split apart or joined together
   b  : having or involving nuclear weapons
: of or relating to the nucleus of an atom
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