Where does “inverno” come from?

inverno (Old Portuguese) comes from Vulgar Latin invernum, from Latin hibernum, from Latin hibernus, from Proto-Italic heimrinos, from Proto-Indo-European ǵʰey-m-r-ino-s, from Proto-Indo-European ǵʰey- — winter.

Ancestry of “inverno”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	invernum	—
2	Latin	hibernum	winter; winter quarters; nominative neuter...
3	Latin	hibernus	wintry; of or pertaining to winter; suitable for...
4	Proto-Italic	heimrinos	—
5	Proto-Indo-European	ǵʰey-m-r-ino-s	—
6	Proto-Indo-European	ǵʰey-	winter

Words derived from “inverno”

inverno
inverno

Every word from Proto-Indo-European ǵʰey- →Every word from Proto-Indo-European ǵʰey-m-r-ino-s →Every word from Proto-Italic heimrinos →