a combining form with the meanings “dealing with radiant energy” (radiometer ), “employing or dealing with radio waves” (radioacoustics; radiolocation; radiotelephone ), “emitting rays as a result of the breakup of atomic nuclei” (radioactive; radiocarbon ), “characterized by, employing or dealing with such rays” (radiography; radiopaque; radiotherapy ).

< French, combining form representing Latin radius beam, ray, radius Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
combining form
1.  denoting radio, broadcasting, or radio frequency: radiogram
2.  indicating radioactivity or radiation: radiochemistry; radiolucent
3.  indicating a radioactive isotope or substance: radioactinium; radiothorium; radioelement
[from French, from Latin radius ray; see radius]

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American Heritage
Medical Dictionary

radio- or radi-

  1. Radiation; radiant energy: radiometer.

  2. Radioactive: radiochemistry.

  3. Radius: radiobicipital.

The American Heritage® Stedman's Medical Dictionary
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