Where does “sanguis” come from?

sanguis (Latin) comes from Proto-Italic *sangwens, from Proto-Indo-European h₁sh₂-én-, from Proto-Indo-European h₁ésh₂r̥ — blood.

Ancestry of “sanguis”, step by step

Step	Language	Word	Meaning
1	Proto-Italic	*sangwens	—
2	Proto-Indo-European	h₁sh₂-én-	—
3	Proto-Indo-European	h₁ésh₂r̥	blood

sanguis — Etymology, Origin & Word History | Etymology Explorer