Where does “hydrothermal” come from?
hydrothermal (French) comes 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.
hydrothermal (French): hydrothermal
Ancestry of “hydrothermal”, step by step