Where does “ātr̥-” come from?

ātr̥- (Proto-Iranian) comes from Proto-Indo-European h₂eh₁ter- — fire.

Ancestry of “ātr̥-”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeanh₂eh₁ter-fire

Words derived from “ātr̥-

Every word from Proto-Indo-European h₂eh₁ter-
ātr̥- — Etymology, Origin & Word History | Etymology Explorer