Lithuanian aštrus

← Proto-Balto-Slavic *aśras (inherited)

← Proto-Indo-European *h₂eḱ- (root)

← Proto-Indo-European *h₂ḱrós (inherited)

← Old Lithuanian *ãštras (inherited)

← Serbo-Croatian oštar (cognate)

← Slovene oster (cognate)

→ Lithuanian bukas (link)