Where does “subtropical” come from?

subtropical (Galician) comes from Galician sub-, from Latin sub, from Proto-Italic supo, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

subtropical (Galician): subtropical

Definitions

subtropical

Ancestry of “subtropical”, step by step

Step	Language	Word	Meaning
1	Galician	sub-	sub
2	Latin	sub	under, beneath; behind; at the feet of
3	Proto-Italic	supo	under
4	Proto-Indo-European	upó	under, below
5	Proto-Indo-European	h₃ewp-	—

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