Where does “pȳthium” come from?

pȳthium (New Latin) comes from Ancient Greek πῡ́θω — I cause to rot; I putrefy.

Ancestry of “pȳthium”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πῡ́θω	I cause to rot; I putrefy

pȳthium — Etymology, Origin & Word History | Etymology Explorer