Etymology
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pyrexia (n.)

"fever, a higher bodily temperature than is normal," 1769, medical Latin, from Greek pyrexis "feverishness," from pyressein "to be feverish, to be ill of fever," from pyretos "fever, burning heat" (related to pyr "fire," from PIE root *paewr- "fire") + abstract noun ending -ia. Formerly sometimes nativized as pyrexy. Related: Pyrexial; pyrexic; pyrexical.

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Definitions of pyrexia

pyrexia (n.)
a rise in the temperature of the body; frequently a symptom of infection;
Synonyms: fever / febrility / febricity / feverishness
From wordnet.princeton.edu