Definition of radio- in English:

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radio-

Pronunciation: /ˈreɪdɪəʊ/

combiningForm

1Denoting radio waves or broadcasting: radio-controlled radiogram
2 Physics Connected with rays, radiation, or radioactivity: radiogenic radiograph
2.1Denoting artificially prepared radioisotopes of elements: radio-cobalt
3 Anatomy Belonging to the radius in conjunction with some other part: radio-carpal

Origin

Late 19th century: from radio or radius.

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