megalopoleis

Megalopolis³ (pl. Megalopoleis) was labelled “obsolete” in major English-language dictionaries of less than half a century ago⁴.

1963, Duncker and Humblot, Sociologia Internationalis: “The Greeks had a Word for it”, page 170

Other megalopoleis, not yet so large, extend from San Jose through the San Francisco Bay Area to Richmond and Marin County; from San Diego through Los Angeles to Bakersfield; from Milwaukee through Chicago, Gary, South Bend, across southern Michigan to Detroit…

1971, Daniel U. Levine, Education in Metropolitan Areas, page 48

On the other hand, large megalopoleis, such as imperial Constantinople or Rome which drew on resources from broad sections of the Mediterranean, cannot easily be reduced to an expression of the same fundamental ecological mechanism that the authors see governing the majority of infinitely smaller settlements.

2005, Gocha R. Tsetskhladze, Ancient West and East, page 391