>
> Middle Proto-Finnic *os^tra- referred to Balt. *as^tra- < PIE *h2ak^-
'sharp'
>
Also Polish ostry and the Sardinian pythonym colostri, colóstri(g)u,
golosti, etc. as well as Basque gorosti, korosti 'holly tree (Ilex
aquifolium)', a compound whose first member is IE *kel- 'prick'.