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radio frequency
radio galaxy
radio interferometer
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
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radio wave
ra·di·o wave (plural ra·di·o waves)


noun 
Definition:
 
electromagnetic wave: an electromagnetic wave whose frequency falls within the radio spectrum
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