Where does “pretiōsus” come from?

pretiōsus (Latin) comes from Latin pretium, from Proto-Italic pretjom, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “pretiōsus”, step by step

Step	Language	Word	Meaning
1	Latin	pretium	worth, price, value, cost; pay, hire, wage,...
2	Proto-Italic	pretjom	—
3	Proto-Indo-European	per-	before, in front; first; to go through
4	Proto-Indo-European	pr̥tós	passed , crossed

Every word from Proto-Indo-European pr̥tós →

pretiōsus — Etymology, Origin & Word History | Etymology Explorer