Where does “subteran” come from?

subteran (Romanian) comes from French souterrain, from French sous, from Middle French soubs, from Old French soz, from Latin subtus, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó.

subteran (Romanian): underground, subterranean

Definitions

underground, subterranean

Ancestry of “subteran”, step by step

subteran traces back through two separate lines of ancestry.

via French souterrain

Step	Language	Word	Meaning
1	French	souterrain	underground; underground passage, tunnel
2	French	sous	below, under; plural of sou; money
3	Middle French	soubs	under; underneath
4	Old French	soz	under
5	Latin	subtus	below, underneath, beneath
6	Latin	sub	under, beneath; behind; at the feet of
7	Proto-Italic	supo	under
8	Proto-Indo-European	upó	under, below
9	Proto-Indo-European	h₃ewp-	—

via Latin subterraneus

Step	Language	Word	Meaning
1	Latin	subterraneus	underground, subterranean
2	Latin	sub-	under, sub

Every word from Proto-Indo-European h₃ewp- →Every word from Proto-Indo-European upó →Every word from Proto-Italic supo →