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

Examples of RADIOACTIVE

  1. Uranium and plutonium are radioactive.

Origin of RADIOACTIVE

International Scientific Vocabulary
First Known Use: 1898
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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