Where does “polissintético” come from?

polissintético (Portuguese) comes from Portuguese sintético, from Ancient Greek συνθετικός, from Ancient Greek σύνθεσις, from Ancient Greek συντίθημι, from Ancient Greek σῠν-, from Ancient Greek σύν, from Proto-Hellenic *ksún — beside, with.

polissintético (Portuguese): polysynthetic

Definitions

polysynthetic

Ancestry of “polissintético”, step by step

Step	Language	Word	Meaning
1	Portuguese	sintético	synthetic
2	Ancient Greek	συνθετικός	skilled in putting together, constructive;...
3	Ancient Greek	σύνθεσις	a putting together, composition, combination,...
4	Ancient Greek	συντίθημι	to assemble, put together
5	Ancient Greek	σῠν-	together; with, together
6	Ancient Greek	σύν	beside, with
7	Proto-Hellenic	*ksún	beside, with

Every word from Proto-Hellenic *ksún →Every word from Ancient Greek σῠν- →Every word from Ancient Greek συντίθημι →