Sino-Tibetan /ˌsaɪnəʊtɪˈbɛtən/ adjective2 •Of or relating to both China and Tibet.Sino-Tibetan relations are more complicated than the media portrays. •Of the Sino-Tibetan languages, one of the major language families.Mandarin, Burmese, and Tibetan all belong to the Sino-Tibetan language family.