←
Proto-Celtic *exs- (derived)
←
Proto-Celtic *rādīti (derived(ga/gd))
←
Old Church Slavonic радити (cognate)
←
Scottish Gaelic ràdh (cognate)
←
Proto-Indo-European *bʰer- (root)
←
Proto-Indo-European *bʰer- (derived)
←
Proto-Indo-European *Hreh₁dʰ- (derived(ga/gd))
←
Old Irish rád (inherited)