Where does “języcysko” come from?

języcysko (Polish) comes from Polish język, 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.

Ancestry of “języcysko”, step by step

StepLanguageWordMeaning
1Polishjęzyktongue; language; language, tongue
2Proto-Slavicęzykъtongue; language
3Proto-Balto-Slavicinźūˀ-kas—
4Proto-Balto-Slavic*inźūˀstongue
5Proto-Balto-Slavic*dinźūˀs—
6Proto-Indo-Europeandn̥ǵʰwéh₂stongue
Every word from Proto-Indo-European dn̥ǵʰwéh₂s →Every word from Proto-Balto-Slavic *dinźūˀs →Every word from Proto-Balto-Slavic *inźūˀs →