Where does “metrapolitan” come from?

metrapolitan (Old Irish) comes from Latin mētropolītānus, from Ancient Greek μητροπολίτης, from Ancient Greek μητρόπολις, from Ancient Greek πόλις, from Proto-Hellenic ptólis, from Proto-Indo-European tpólHis, from Proto-Indo-European tpelH- — fortification, city.

Ancestry of “metrapolitan”, step by step

StepLanguageWordMeaning
1Latinmētropolītānusmetropolitan
2Ancient Greekμητροπολίτηςmetropolitan
3Ancient Greekμητρόπολιςmother-state; one's mother-city, mother country,...
4Ancient Greekπόλιςcity; a whole country, as dependent on and called...
5Proto-Hellenicptóliscity
6Proto-Indo-EuropeantpólHis
7Proto-Indo-EuropeantpelH-fortification, city
Every word from Proto-Indo-European tpelH-Every word from Proto-Indo-European tpólHisEvery word from Proto-Hellenic ptólis