Where does “synoniem” come from?

synoniem (Dutch) comes from Latin synōnymum, from Ancient Greek συνώνυμος, from Ancient Greek σῠν-, from Ancient Greek σύν, from Proto-Hellenic *ksún — beside, with.

synoniem (Dutch): synonymous, having the same meaning;...

Definitions

synonymous, having the same meaning;...

Ancestry of “synoniem”, step by step

Step	Language	Word	Meaning
1	Latin	synōnymum	synonym
2	Ancient Greek	συνώνυμος	Having the same name; Having only one meaning:...
3	Ancient Greek	σῠν-	together; with, together
4	Ancient Greek	σύν	beside, with
5	Proto-Hellenic	*ksún	beside, with

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