Where does “opnis” come from?

opnis (Proto-Italic) comes from Proto-Indo-European h₃ep-ni-s, from Proto-Indo-European h₃ep- — to work, toil, make; ability, force.

Ancestry of “opnis”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	h₃ep-ni-s	working
2	Proto-Indo-European	h₃ep-	to work, toil, make; ability, force

opnis — Etymology, Origin & Word History | Etymology Explorer