Welsh aradr

← Proto-Brythonic *aradr (inherited)

← Proto-Celtic *aratrom (inherited)

← Proto-Indo-European *h₂erh₃- (root)

← Proto-Indo-European *h₂érh₃trom (inherited)

← Latin arātrum (cognate)

← Old Irish arathar (cognate)

→ Polish radło (cognate)