Where does “ἐργαστήριον” come from?

ἐργαστήριον (Ancient Greek) comes from Ancient Greek ἐργαστής, from Ancient Greek ἐργάζομαι, from Ancient Greek ἔργον, from Proto-Hellenic wérgon, from Proto-Indo-European wérǵom, from Proto-Indo-European werǵ- — to make.

ἐργαστήριον (Ancient Greek): workshop, factory