arcologies

/AA1 R K AA1 L AH0 JH IY0 Z/
noun
  1. 1

    (urban studies) Urban development theory proposed by Paolo Soleri involving three-dimensional building methods and efficient use of space and resources.

  2. 2

    An extremely large habitat or settlement, sufficient to maintain an internal ecology as well as an extremely high human population density.

Source: https://en.wiktionary.org/wiki/arcologies, https://en.wiktionary.org/wiki/arcology