Where does “fotosintetic” come from?

fotosintetic (Romanian) comes from French photosynthétique, from French synthétique, 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.

fotosintetic (Romanian): photosynthetic

Definitions

photosynthetic

Ancestry of “fotosintetic”, step by step

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

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