Where does “etero” come from?

etero (Ido) comes from Latin aethēr, from Ancient Greek Αἰθήρ, from Ancient Greek αἴθω, from Proto-Hellenic *áitʰō.

etero (Ido): ether

Definitions

Step	Language	Word	Meaning
1	Latin	aethēr	—
2	Ancient Greek	Αἰθήρ	Upper Air
3	Ancient Greek	αἴθω	To ignite, kindle, light; To burn, blaze
4	Proto-Hellenic	*áitʰō	—

etero — Etymology, Origin & Word History | Etymology Explorer