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

Definitions

  1. blade

Ancestry of “острость”, step by step

StepLanguageWordMeaning
1Old Church Slavonicостръsharp; rough
2Proto-Slavicostrъsharp
3Proto-Balto-Slavicaśrassharp
4Proto-Indo-European*h₂eḱróssharp
5Proto-Indo-Europeanh₂eḱ-sharp
Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European *h₂eḱrós →Every word from Proto-Balto-Slavic aśras →