Where does “*atra” come from?

*atra (Proto-Finno-Ugric) comes from Proto-Germanic arþrą, from Proto-Indo-European h₂érh₃trom, from Proto-Indo-European h₂erh₃-, from Proto-Indo-European h₁er- — earth.

Ancestry of “*atra”, step by step

StepLanguageWordMeaning
1Proto-Germanicarþrąplough
2Proto-Indo-Europeanh₂érh₃tromplough, ard
3Proto-Indo-Europeanh₂erh₃-to plough
4Proto-Indo-Europeanh₁er-earth

Words derived from “*atra

Every word from Proto-Indo-European h₁er-Every word from Proto-Indo-European h₂erh₃-Every word from Proto-Indo-European h₂érh₃trom