radioactive
ra·dio·ac·tive
adj \ˌrād-ē-ō-ˈak-tiv\Definition of RADIOACTIVE
: of, caused by, or exhibiting radioactivity <radioactive isotopes>
—ra·dio·ac·tive·ly adverb
Learn More About
Ask The Editor Videos
Seen & Heard 
What made you want to look up radioactive? Please tell us where you read or heard it (including the quote, if possible).
