Definition of radio- in English:

radio-

Pronunciation: /ˈreɪdɪəʊ/

combining form

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

from radio or radius.

Definition of radio- in:

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose