First Known Use: 1898
Dictionary
radioactive
adjective ra·dio·ac·tive \ˌrā-dē-ō-ˈak-tiv\
: having or producing a powerful and dangerous form of energy (called radiation)
Full Definition of RADIOACTIVE
: of, caused by, or exhibiting radioactivity
— ra·dio·ac·tive·ly adverb
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Origin of RADIOACTIVE
International Scientific Vocabulary
RADIOACTIVELY Defined for Kids
radioactive
adjective ra·dio·ac·tive \ˌrā-dē-ō-ˈak-tiv\
Definition of RADIOACTIVE for Kids
: caused by or exhibiting radioactivity <a radioactive element>
Medical Dictionary
radioactive
adjective ra·dio·ac·tive \ˌrād-ē-ō-ˈak-tiv\
Medical Definition of RADIOACTIVE
: of, caused by, or exhibiting radioactivity <radioactive isotopes>
—ra·dio·ac·tive·ly adverb
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