Radio- pref. A combining form indicating connection with, or relation to, a radius or ray; specifically (Anat.), with the radius of the forearm; as, radio-ulnar, radio-muscular, radio-carpal.
...radio-telephony and want me to explain it to you. I'll do so in the shortest and easiest way which I can devise. The explanation will be the simplest which I can give and still make it possible for you to build and operate your own set and to understand the operation of the large commercial sets ... — Letters of a Radio-Engineer to His Son • John Mills
... matters, when on the fourth of March last, our textile company ordered me to France to straighten out some orders with the France house, the situation being such that they preferred to send a man. Why they did not use radio-vision I do not care to state, as this is ... — The Undersea Tube • L. Taylor Hansen