Where does “unterirdisch” come from?

unterirdisch (German) comes from German unter-, from German Unter, from Middle High German under, from Old High German untar, from Proto-Germanic under, from Proto-Indo-European h₁entér, from Proto-Indo-European h₁en — in; in, inside.

unterirdisch (German): underground, subterranean; abysmal

Definitions

  1. underground, subterranean; abysmal

Ancestry of “unterirdisch”, step by step

StepLanguageWordMeaning
1Germanunter-sub-, under-
2GermanUnterjack, knave
3Middle High Germanunder—
4Old High Germanuntarunder
5Proto-Germanicunderamong, between; under, beneath; under
6Proto-Indo-Europeanh₁entérbetween
7Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European h₁en →Every word from Proto-Indo-European h₁entér →Every word from Proto-Germanic under →