Thermal
来自Big Physics
mid 18th century (in the sense ‘relating to hot springs’): from French, from Greek thermē ‘heat’.
wiktionary
From French thermal, from New Latin *thermalis, from Ancient Greek θέρμη(thérmē, “heat”), from Proto-Indo-European *gʷʰer-(“to heat, warm”).
etymonline
thermal (adj.)
1756, "having to do with hot springs," from French thermal (Buffon), from Greek therme "heat, feverish heat," from PIE root *gwher- "to heat, warm." Sense of "having to do with heat" is first recorded 1837. The noun meaning "rising current of relatively warm air" is recorded from 1933.
