Where does “острость” come from?
острость (Old Church Slavonic) comes from Old Church Slavonic остръ, from Proto-Slavic ostrъ, from Proto-Balto-Slavic aśras, from Proto-Indo-European *h₂eḱrós, from Proto-Indo-European h₂eḱ- — sharp.
острость (Old Church Slavonic): blade
Ancestry of “острость”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | Old Church Slavonic | остръ | sharp; rough |
| 2 | Proto-Slavic | ostrъ | sharp |
| 3 | Proto-Balto-Slavic | aśras | sharp |
| 4 | Proto-Indo-European | *h₂eḱrós | — |
| 5 | Proto-Indo-European | h₂eḱ- | sharp |