pyrexia

from WordNet (r) 3.0 (2006)

pyrexia
    n 1: a rise in the temperature of the body; frequently a symptom
         of infection [syn: {fever}, {febrility}, {febricity},
         {pyrexia}, {feverishness}]

from The Collaborative International Dictionary of English v.0.48

Pyrexia \Py*rex"i*a\, n.; pl. {Pyrexi[ae]}. [NL., fr. Gr. ? to
   be feverish, akin to ? fever.] (Med.)
   The febrile condition.
   [1913 Webster] Pyrexial

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