Where does “praedocturus” come from?

praedocturus (Latin) comes from Latin praedoceo, from Latin prae-, from Proto-Italic prai-, from Proto-Indo-European preh₂-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Definitions

Ancestry of “praedocturus”, step by step

Step	Language	Word	Meaning
1	Latin	praedoceo	I teach, instruct or inform beforehand
2	Latin	prae-	before; in front; in charge
3	Proto-Italic	prai-	pre-, before
4	Proto-Indo-European	preh₂-	before, in front
5	Proto-Indo-European	per-	before, in front; first; to go through
6	Proto-Indo-European	pr̥tós	passed , crossed

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European preh₂- →