Where does “zrno” come from?
zrno (Old Czech) comes 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 “zrno”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Slavic | zьrno | grain |
| 2 | Proto-Balto-Slavic | *źírˀnan | — |
| 3 | Proto-Indo-European | ǵr̥h₂nóm | grain |
| 4 | Proto-Indo-European | ǵr̥h₂nós | matured, grown old |
| 5 | Proto-Indo-European | ǵerh₂- | to grow old, to mature |