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radio beam
radio button
radio car
radio cassette
radio compass
radio-controlled
radio frequency
radio galaxy
radio interferometer
radio jet
radio source
radio spectrum
radio star
radio telescope
radio wave
radioactive
radioactive dating
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radiocarbon
ra·di·o·car·bon [ ràydee ō krbən ]


noun 
Definition:
 
radioactive carbon: a radioactive form of carbon, especially the isotope of carbon that has a mass number of 14
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