Where does “nubilo” come from?

nubilo (Latin) comes from Latin nūbilum, from Latin nūbilus, from Latin -idus, from Proto-Italic *-iðos.

Ancestry of “nubilo”, step by step

Step	Language	Word	Meaning
1	Latin	nūbilum	—
2	Latin	nūbilus	—
3	Latin	-idus	tending to
4	Proto-Italic	*-iðos	—

nubilo — Etymology, Origin & Word History | Etymology Explorer