köken: Etymology tree Proto-Indo-European *h₂eǵ-? Proto-Indo-European *h₂éǵros Proto-Hellenic *agrós Ancient Greek ἀγρός (agrós)der. Polish agro- Proto-Indo-European *ǵʰeh₂-der. Ancient Greek χαῦνος (khaûnos) Ancient Greek χάος (kháos)der. Dutch gasbor. French gazbor. Polish gaz Polish agrogaz From agro- + gaz. First attested in 1929.