radiotelegraphyEnglishOxford New American Dictionaryradiotelegraphy /ˌrādēōtəˈleɡrəfē, ˌreɪdioʊtəˈlɛɡrəfi / ▸ noun mainly historical telegraphy using radio transmission. – DERIVATIVES radiotelegraph /-ˈteləˌɡraf/ noun