Radioactivity Definition
rādē-ō-ăk-tĭvĭ-tē
noun
Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
American Heritage Medicine
The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
American Heritage Medicine
Synonyms:
- radiation
- radioactive particles
- Roentgen rays
- radiant-energy
Other Word Forms of Radioactivity
Noun
Singular:
radioactivity
Plural:
radioactivitiesOrigin of Radioactivity
-
radioactive +"Ž -ity
From Wiktionary
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