Learn how to say Metropolises correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word metropolis:
the capital or chief city of a country or region:
he preferred the peaceful life of the countryside to the bustle of the metropolis
a very large and busy city:
by the late eighteenth century Edo had grown to a metropolis with a population of nearly one million
late Middle English (denoting the see of a metropolitan bishop): via late Latin from Greek mētropolis ‘mother state’, from mētēr, mētr- ‘mother’ + polis ‘city’