Definition of radioactive adjective from the Oxford Advanced Learner's Dictionary

 

radioactive

 adjective
adjective
BrE BrE//ˌreɪdiəʊˈæktɪv//
 
; NAmE NAmE//ˌreɪdioʊˈæktɪv//
 
Energy and physical forces
 
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sending out harmful radiation caused when the nuclei (= central parts) of atoms are broken up See related entries: Energy and physical forces
See the Oxford Advanced American Dictionary entry: radioactive