Where does “úttaras” come from?

úttaras (Proto-Indo-Aryan) comes from Proto-Indo-Iranian útˢtaras, from Proto-Indo-European údteros, from Proto-Indo-European úd — out, outward.

Ancestry of “úttaras”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iranianútˢtaras—
2Proto-Indo-Europeanúdteroshigher, outer
3Proto-Indo-Europeanúdout, outward
Every word from Proto-Indo-European úd →Every word from Proto-Indo-European údteros →Every word from Proto-Indo-Iranian útˢtaras →