Where does “зерня” come from?

зерня (Ukrainian) comes from Ukrainian зерно, from Proto-Slavic zьrno, from Proto-Balto-Slavic *źírˀnan, from Proto-Indo-European ǵr̥h₂nóm, from Proto-Indo-European ǵr̥h₂nós, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

Ancestry of “зерня”, step by step

StepLanguageWordMeaning
1Ukrainianзерноgrain, cereal; seed
2Proto-Slaviczьrnograin
3Proto-Balto-Slavic*źírˀnangrain
4Proto-Indo-Europeanǵr̥h₂nómgrain
5Proto-Indo-Europeanǵr̥h₂nósmatured, grown old
6Proto-Indo-Europeanǵerh₂-to grow old, to mature
Every word from Proto-Indo-European ǵerh₂- →Every word from Proto-Indo-European ǵr̥h₂nós →Every word from Proto-Indo-European ǵr̥h₂nóm →