Russian выдра

← Proto-Balto-Slavic *ūdrāˀ (inherited)

← Proto-Indo-European *wed- (root)

← Proto-Indo-European *udréh₂ (inherited)

← Proto-Indo-European *udrós (mention)

← Russian ги́дра (doublet)

← Proto-Slavic *vydra (inherited)

→ Latin lutra (cognate)