Where does “ekstertera” come from?

ekstertera (Esperanto) comes from Esperanto Tero, from French Terre, from Middle French terre, from Old French terre, from Latin Terra, from Proto-Indo-European ters- — dry.

ekstertera (Esperanto): extraterrestrial

Definitions

extraterrestrial

Ancestry of “ekstertera”, step by step

ekstertera traces back through two separate lines of ancestry.

via Esperanto Tero

Step	Language	Word	Meaning
1	Esperanto	Tero	Earth
2	French	Terre	Earth; the Earth
3	Middle French	terre	earth; soil; land, property
4	Old French	terre	earth; soil; land, property
5	Latin	Terra	Terra goddess of the Earth
6	Proto-Indo-European	ters-	dry

via Esperanto ekster

Step	Language	Word	Meaning
1	Esperanto	ekster	outside
2	Latin	extrā	on the outside
3	Latin	exter	On the outside, outward, external, outer; Of...
4	Proto-Italic	*eksteros	—

Every word from Proto-Indo-European ters- →Every word from Latin Terra →Every word from Old French terre →