Where does “wrd-” come from?

wrd- (Middle Persian) comes from Old Persian ???, from Proto-Iranian wart-, from Proto-Indo-Iranian wart-, from Proto-Indo-European wert-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “wrd-”, step by step

StepLanguageWordMeaning
1Old Persian???—
2Proto-Iranianwart-to turn, spin, rotate; to writhe
3Proto-Indo-Iranianwart-—
4Proto-Indo-Europeanwert-to turn, to rotate
5Proto-Indo-Europeanwer-to burn; to cover, heed, notice; squirrel
Every word from Proto-Indo-European wer- →Every word from Proto-Indo-European wert- →Every word from Proto-Indo-Iranian wart- →