Where does “autótrofo” come from?

autótrofo (Spanish) comes from Spanish auto-, from Ancient Greek αὐτο-, from Ancient Greek αὐτός, from Proto-Indo-European h₂ew, from Proto-Indo-European ǵʰe — Postpositional intensifying particle: indeed, at any rate, in fact.

autótrofo (Spanish): autotroph; autotrophic