Serb ‧ o-Cro ‧ a ‧ tian /ˌsɜːbəʊ krəʊˈeɪʃ ə n◂ $ ˌsɜːr-/ BrE AmE ( also ˌSerbo-ˈCroat ) noun [uncountable]
the language of the Serbs and the Croats. The Serbian form is written in the Cyrillic alphabet and the Croatian form in the Roman alphabet. Since 1992, the Croatian language has changed a lot to make it different from Serbian.
—Serbo-Croatian adjective