Where does “θέρμη” come from?

θέρμη (Ancient Greek) comes from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.

Ancestry of “θέρμη”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	gʷʰer-	warm, hot
2	Proto-Indo-European	gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr	—

θέρμη — Etymology, Origin & Word History | Etymology Explorer