Where does “polythermal” come from?

polythermal (English) comes from English thermal, from French thermal, from New Latin thermalis, from Ancient Greek Θέρμη, from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.

polythermal (English): Describing a method of establishing the...

Definitions

Describing a method of establishing the...

Ancestry of “polythermal”, step by step

Step	Language	Word	Meaning
1	English	thermal	A column of rising air in the lower atmosphere...
2	French	thermal	thermal
3	New Latin	thermalis	—
4	Ancient Greek	Θέρμη	Therma, Macedonia, Greece
5	Proto-Indo-European	gʷʰer-	warm, hot
6	Proto-Indo-European	gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr	—

Every word from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr →Every word from Proto-Indo-European gʷʰer- →Every word from Ancient Greek Θέρμη →