Where does “у́стье” come from?
у́стье (Russian) comes from Proto-Slavic ustьje, from Proto-Slavic ustà, from Proto-Indo-European h₃éh₁os — mouth.
Ancestry of “у́стье”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Proto-Slavic | ustьje | — |
| 2 | Proto-Slavic | ustà | — |
| 3 | Proto-Indo-European | h₃éh₁os | mouth |