Where does “Erdwärme” come from?

Erdwärme (German) comes from German Wärme, from Middle High German werme, from Old High German warmī, from Old High German warm, from Proto-West Germanic warm, from Proto-Germanic warmaz, from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.

Erdwärme (German): geothermal heat

Definitions

  1. geothermal heat

Ancestry of “Erdwärme”, step by step

Erdwärme traces back through two separate lines of ancestry.

via German Wärme

StepLanguageWordMeaning
1GermanWärmewarmth; heat
2Middle High Germanwerme—
3Old High Germanwarmīwarmth
4Old High Germanwarmwarm
5Proto-West Germanicwarmwarm
6Proto-Germanicwarmazwarm
7Proto-Indo-Europeangʷʰer-warm, hot
8Proto-Indo-Europeangʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr—

via German ërde

StepLanguageWordMeaning
1Germanërdeearth
2Middle High Germanërdeearth
3Old High GermanerdaThe Earth; earth, ground, soil
4Proto-West Germanicerþuearth, world; earth, soil
5Proto-Germanicerþōearth
6Proto-Indo-Europeanh₁er-earth

Words derived from “Erdwärme”

Every word from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr →Every word from Proto-Indo-European gʷʰer- →Every word from Proto-Germanic warmaz →