Where does “slidʰ-ró-s” come from?

slidʰ-ró-s (Proto-Indo-European) comes from Proto-Indo-European sleydʰ- — to slip, slide; to be slippery, slick.

Ancestry of “slidʰ-ró-s”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	sleydʰ-	to slip, slide; to be slippery, slick

slidʰ-ró-s — Etymology, Origin & Word History | Etymology Explorer