radio-EnglishOxford Dictionary of Englishradio- /ˈreɪdiəʊ / ▸ combining form 1 denoting radio waves or broadcasting: radio-controlled radiogram. 2 Physics connected with rays, radiation, or radioactivity: radiogenic radiograph. ▪ denoting 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.