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
See radioactive defined for English-language learners
See radioactive defined for kids
ADVERTISEMENT
Origin of RADIOACTIVE
International Scientific Vocabulary
RADIOACTIVE 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
Learn More About RADIOACTIVE
Browse
Next Word in the Dictionary: radioactive chainPrevious Word in the Dictionary: radioactivateAll Words Near: radioactive
ADVERTISEMENT
Seen & Heard
What made you want to look up radioactive? Please tell us where you read or heard it (including the quote, if possible).