Where does “organa” come from?

organa (Medieval Latin) comes from Ancient Greek ὄργανον, from Proto-Indo-European werǵ- — to make.

Ancestry of “organa”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ὄργανον	instrument, implement, tool; sense organ; musical...
2	Proto-Indo-European	werǵ-	to make

organa — Etymology, Origin & Word History | Etymology Explorer