D defs.my
Entry 2 senses Webster, 1913

Megalopolis

/(mĕg`ȧ*lŏp"ō̇*lĭs)/ · Meg·a·lop·o·lis · IPA /mɛ.ɡəˈlɒ.pə.lɪs/
01 n. A chief city; a very large cuity; a metropolis.
  1. 1.
    A chief city; a very large cuity; a metropolis.
  2. 2.
    A region in which the suburbs of several large cities merge to form one large predominantly urbanized area.