radioactivity
ra·dioac·ti·vity
noun
1.
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
Origin
From radioactive + -ity or radio- + activity.
Phrases
- nuclear radiation
- radiation poisoning
- radioactive decay
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.