Hypothermia

google

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late 19th century: from hypo- ‘below’ + Greek thermē ‘heat’.

wiktionary

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New Latin, from Ancient Greek ὑπο-(hupo-, “under”) +‎ θέρμη(thérmē, “heat”).

etymonline

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hypothermia (n.)

1877, Modern Latin, from hypo- "under" (see hypo-) + Greek therme "heat" (from PIE root *gwher- "to heat, warm") + abstract noun ending -ia.