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noun Pathology.
  1. fever.
  2. feverish condition.
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Origin of pyrexia

1760–70; < New Latin < Greek pýrex(is) feverishness + -ia -ia
Related formspy·rex·i·al, py·rex·ic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples

British Dictionary definitions for pyrexia


  1. a technical name for fever
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Derived Formspyrexial or pyrexic, adjective

Word Origin

C18: from New Latin, from Greek purexis, from puressein to be feverish, from pur fire
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for pyrexia


"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.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

pyrexia in Medicine


  1. fever
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Related formspy•rexi•al null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.