Dictionary

radioactivity

noun ra·dio·ac·tiv·i·ty \-ak-ˈti-və-tē\

Definition of RADIOACTIVITY

:  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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Origin of RADIOACTIVITY

International Scientific Vocabulary
First Known Use: 1899

Rhymes with RADIOACTIVITY

RADIOACTIVITY Defined for Kids

radioactivity

noun ra·dio·ac·tiv·i·ty \ˌrā-dē-ō-ak-ˈti-və-tē\

Definition of RADIOACTIVITY for Kids

1
:  the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium)
2
:  the rays or particles that are given off when atoms break apart
Medical Dictionary

radioactivity

noun ra·dio·ac·tiv·i·ty \-ak-ˈtiv-ət-ē\
plural ra·dio·ac·tiv·i·ties

Medical Definition of RADIOACTIVITY

:  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

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