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hyperthermia

/ˌhaɪpə(ɹ)ˈθɜː(ɹ)miə/

abnormally high body temperature

From Greek hyper (over) + Greek therm (heat).

noun
noun
hyper
Greek
ὑπέρ (hupér)
over, above, beyond; the sense of excess is already built in
Medical/Scientific Latin
hyper-
used as a prefix meaning excessive or above normal
therm
Proto-Indo-European
*gwher-
to heat, warm
Greek
θέρμη (thérmē)
heat, feverish heat
Medical/Scientific Latin
therm-
element used in learned compounds about heat
Combined
hyperthermia
coined in medical Latin in 1878 to name a condition of excessive heat
Modern English
hyperthermia
used chiefly in medicine for dangerous overheating or therapeutic heating
Modern English
hyperthermia

This is a word that sounds as if it arrived wearing a white lab coat. In 1878, medical Latin stitched together hyper- and therm- to name a body running too hot, and the result is wonderfully transparent once you see it: not just heat, but heat gone past the line. The first half shows up in hyperactive and hypercritical; the second is the same ancient heat that warms thermal baths and powers thermometers. Greek did the heavy lifting on both sides, which means the word is almost a little etymological overkill: excess plus heat, as if one warning label weren’t enough. Say it out loud and you can practically feel the fever rising.

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