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radio jet
radio source
radio spectrum
radio star
radio telescope
radio wave
radioactive
radioactive dating
radioactive decay
radioactive series
radioactive tracer
radioactive waste
radioactivity
radiobiology
radiobroadcasting
radiocarbon
radiocarbon dating
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radioactive decay
ra·di·o·ac·tive de·cay


noun 
Definition:
 
physics 
Same as  decayn (sense 4)

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