Welsh cadair

← Proto-Brythonic *kadėr (inherited)

← Ancient Greek καθέδρα (derived)

← Cornish kador (cognate)

← Latin cathedra (derived)

← Middle Welsh cadeir (inherited)

← Middle Breton cadoer (cognate)

→ Welsh cadeiriau (affix)

→ Welsh cadeirau (affix)

→ Welsh cadeirydd (affix)

→ Welsh cadeirio (affix)

→ Manx caair (cognate)

→ Cornish kador (cognate)