Where does “perītus” come from?

perītus (Latin) comes from Latin perior, from Proto-Indo-European perh₃- — to provide; bestow, give; to grant.

Ancestry of “perītus”, step by step

Step	Language	Word	Meaning
1	Latin	perior	I go through
2	Proto-Indo-European	perh₃-	to provide; bestow, give; to grant