Meaning of “radioactive” in the English Dictionary

"radioactive" in British English

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radioactiveadjective

uk /ˌreɪ.di.əʊˈæk.tɪv/ us /ˌreɪ.di.oʊˈæk.tɪv/

having or producing the energy that comes from the breaking up of atoms:

Uranium is a radioactive material.
radioactive waste

(Definition of “radioactive” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radioactive" in American English

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radioactiveadjective

us /ˌreɪ·di·oʊˈæk·tɪv/

physics possessing or producing energy from the breaking up of atoms, or resulting from the production of such energy:

radioactive waste
radioactivity
noun [ U ] us /ˌreɪ·diˌoʊ·ækˈtɪv·ɪ·t̬i/

(Definition of “radioactive” from the Cambridge Academic Content Dictionary © Cambridge University Press)