Where does “wirˀ-” come from?

wirˀ- (Proto-Balto-Slavic) comes from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

Ancestry of “wirˀ-”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	wer-	to burn; to cover, heed, notice; squirrel

wirˀ- — Etymology, Origin & Word History | Etymology Explorer