Where does “тонкий” come from?
тонкий (Russian) comes from Old East Slavic тънъкъ, from Proto-Slavic tьnъkъ, from Proto-Indo-European ténh₂us, from Proto-Indo-European tenh₂-, from Proto-Indo-European ten- — to stretch, to extend.
Ancestry of “тонкий”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old East Slavic | тънъкъ | — |
| 2 | Proto-Slavic | tьnъkъ | thin |
| 3 | Proto-Indo-European | ténh₂us | thin |
| 4 | Proto-Indo-European | tenh₂- | to stretch, to extend |
| 5 | Proto-Indo-European | ten- | to stretch, to extend |