Where does “intenero” come from?

intenero (Latin) comes from Latin tener, from Proto-Indo-European ten- — to stretch, to extend.

Ancestry of “intenero”, step by step

Step	Language	Word	Meaning
1	Latin	tener	soft, delicate, tender; young, youthful;...
2	Proto-Indo-European	ten-	to stretch, to extend

intenero — Etymology, Origin & Word History | Etymology Explorer