Wurdahuzdą: Proto-Germanic dictionary — *austrą Scott K. Shay Wardja Press https://protogermanic.org/pgmc_austrą_2

Single-entry extract from the dictionary. Cross-references to other entries point to their identifiers in the full dictionary.

 Etymologisches Wörterbuch des Althochdeutschen VI Rosemarie Lühr Vandenhoeck & Ruprecht 2017
austrą ˈɑu̯s.trɑ̃ ᚨᚢᛊᛏᚱᚨ
adverb east, eastward Adverbialized accusative singular of the *austra- formation represented by the adjective *austraz, originally ‘to the east, eastward’. EWA reconstructs an old accusative *austran < pre-Germanic *aus-tro-m, rather than an endingless locative **austre Lühr 2017: s.v. ôstar. See *austraz for the deeper etymology.