English

hypothermal

From hypo- + thermal.

Proto-Indo-European *upó ‘under, below’

Ancient Greek ὑπό ‘under’

English hypo-

Proto-Indo-European *gʷʰer- ‘to heat, warm’

Ancient Greek θέρμη ‘heat’

New Latin *thermalis

French thermal

Today it means

adj Involving extremely low temperatures.

Language periods are conventional ranges, not dates for this word.

Etymograph / hypothermal