←
Proto-Balto-Slavic *dubr- (derived)←
Proto-Indo-European *dʰewb- (root)←
Proto-Indo-European *dʰubr- (derived)←
Proto-Indo-European *dʰewbʰ- (mention)←
Old East Slavic дъбрь (inherited)←
Old East Slavic дьбрь (mention)←
Proto-Slavic *dьbrь (inherited)