Where does “endossimbiose” come from?

endossimbiose (Portuguese) comes from Portuguese endo-, from Ancient Greek ἔνδον, from Proto-Hellenic éndon, from Proto-Indo-European h₁n̥dóm, from Proto-Indo-European h₁n̥dó, from Proto-Indo-European h₁én — in.

endossimbiose (Portuguese): endosymbiosis

Definitions

endosymbiosis

Ancestry of “endossimbiose”, step by step

Step	Language	Word	Meaning
1	Portuguese	endo-	end-/endo-
2	Ancient Greek	ἔνδον	in, within
3	Proto-Hellenic	éndon	—
4	Proto-Indo-European	h₁n̥dóm	inside
5	Proto-Indo-European	h₁n̥dó	into, inside
6	Proto-Indo-European	h₁én	in

Every word from Proto-Indo-European h₁én →Every word from Proto-Indo-European h₁n̥dó →Every word from Proto-Indo-European h₁n̥dóm →