radiotelephone Syllabification: (ra·di·o·tel·e·phone)Pronunciation: /ˌrādēōˈteləˌfōn/Definition of radiotelephone noun a telephone that uses radio transmission. Derivatives radiotelephonyPronunciation: /-təˈlefənē/ noun radiotelephonicPronunciation: /-ˌteləˈfänik/ adjective radiotelephone in other Oxford dictionaries Definition of radiotelephone in the British & World English dictionary