Where does “δύστρον” come from?

δύστρον (Ancient Greek) comes from Ancient Greek δύω, from Proto-Indo-European dwóh₁ — two.

Ancestry of “δύστρον”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	δύω	to cause to sink, to plunge; to get into, to...
2	Proto-Indo-European	dwóh₁	two

δύστρον — Etymology, Origin & Word History | Etymology Explorer