conurbation
noun
[ ˌkɒnəˈbeɪʃ(ə)n ]
• an extended urban area, typically consisting of several towns merging with the suburbs of a central city.
• "the major conurbations of London and Birmingham"
Origin:
early 20th century: from con- ‘together’ + Latin urbs, urb- ‘city’ + -ation.
