Old Norse arðr

← Proto-Germanic *arþrą (inherited)

← Proto-Indo-European *h₂erh₃- (root)

← Proto-Indo-European *h₂érh₃trom (inherited)

← Latin aratrum (cognate)

→ English ard (derived)

→ Danish ard (inherited)

→ Finnish aura (cognate)

→ Westrobothnian ahl (inherited)

→ Old Swedish arþer (inherited)

→ Ancient Greek ἄροτρον (cognate)

→ Lithuanian arklas (cognate)

→ Livvi adru (cognate)

→ Swedish årder (inherited)