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radioactivity

One entry found.

Main Entry:
ra·dio·ac·tiv·i·ty 
          Listen to the pronunciation of radioactivity
Pronunciation:
\-ak-ˈti-və-tē\
Function:
noun
Etymology:
International Scientific Vocabulary
Date:
1899
: the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei ; also : the rays emitted


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