Proto-Indo-European *h₂eh₁ter-

→ Avestan 𐬁𐬙𐬀𐬭 (inherited)

→ Persian آذر (inherited)

→ Persian آدر (derived)

→ Irish áith (mention)

→ Manx aiee (mention)

→ Northern Kurdish agir (inherited)

→ Latin atrox (mention)

→ Latin ater (inherited)

→ Latin Atella (derived)

→ Romanian vatră (derived)

→ Albanian vatër (derived)

→ Old Armenian այրեմ (inherited)