[adjective]Radioactive means possessing or producing the energy which comes from the breaking up of atoms.a radioactive gasUranium is a radioactive material.The core of a nuclear reactor is highly radioactive.Radioactive also means resulting from the production of the energy which comes from the breaking up of atoms.The production and storage of radioactive waste is a major international environmental issue.
Meaning of RADIOACTIVE in English
Cambridge English vocab. Кембриджский английский словарь. 2012