Where does “Megalopoli” come from?

Megalopoli (English) comes from Ancient Greek μεγάλος, from Ancient Greek μέγας, from Proto-Indo-European meǵh₂s — great.

Ancestry of “Megalopoli”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	μεγάλος	masculine singular nominative of μέγας
2	Ancient Greek	μέγας	big, large; great, mighty, loud; marvelous,...
3	Proto-Indo-European	meǵh₂s	great

Megalopoli — Etymology, Origin & Word History | Etymology Explorer