Old Irish rigid

← Proto-Celtic *regeti (inherited)

← Proto-Celtic *rigeti (inherited)

← Proto-Indo-European *h₃reǵ- (root)

← Proto-Indo-European *h₃reǵ- (derived)

← Proto-Indo-European *reyǵ- (root)

← Proto-Indo-European *reyǵ- (derived)

→ Old Irish adrig (affix)

→ Old Irish dodúrig (affix)