Frequently a symptom of infection

• A rise in the temperature of the body

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Pyrexia \Py*rex"i*a\, n.; pl. Pyrexi[ae] . [NL., fr. Gr. ? to be feverish, akin to ? fever.] (Med.) The febrile condition.

WordNet Word definitions in WordNet
n. a rise in the temperature of the body; frequently a symptom of infection [syn: fever , febrility , febricity , feverishness ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"fever," 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" (see fire (n.)) + abstract noun ending -ia .

Wiktionary Word definitions in Wiktionary
n. (label en medicine) fever