Where does “jazik” come from?
jazik (Serbo-Croatian) comes from Proto-Slavic ęzykъ, from Proto-Balto-Slavic inźūˀ-kas, from Proto-Balto-Slavic *inźūˀs, from Proto-Balto-Slavic *dinźūˀs, from Proto-Indo-European dn̥ǵʰwéh₂s — tongue.
jazik (Serbo-Croatian): tongue, language
Ancestry of “jazik”, step by step