from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The abatement of a fever.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The departure or subsiding of a fever.

from the GNU version of the Collaborative International Dictionary of English

  • n. A subsiding from a state of ebullition; loss of heat; lukewarmness.
  • n. The subsidence of a febrile process.

from The Century Dictionary and Cyclopedia

  • n. Abatement of heat; the state of growing cool; coolness; lukewarmness.
  • n. In pathology, abatement or decrease of fever or feverish symptoms.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. abatement of a fever as indicated by a reduction in body temperature


From Latin dēfervēscēns, dēfervēscent-, present participle of dēfervēscere, to stop boiling, cool off : dē-, de- + fervēscere, to grow hot, inchoative of fervēre, to be hot, boil; see bhreu- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin defervescere to grow cool. (Wiktionary)


  • Exanthem subitum typically occurs between 6 months and 2 years of age and is characterized by an abrupt rise in temperature, often to approximately 40°C, followed several days later by a rapid defervescence that coincides with the emergence of an erythematous maculopapular rash that can persist for several days.

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