Where does “*slīˀwā́ˀ” come from?

*slīˀwā́ˀ (Proto-Balto-Slavic) comes from Proto-Indo-European (s)leh₃y- — blueish.

Ancestry of “*slīˀwā́ˀ”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)leh₃y-	blueish

*slīˀwā́ˀ — Etymology, Origin & Word History | Etymology Explorer