[New Latin, from Greek purexis, from puressein, to have a fever, from puretos, fever; see pyretic.]
py·rex′i·al, py·rex′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
[C18: from New Latin, from Greek purexis, from puressein to be feverish, from pur fire]
pyˈrexial, pyˈrexic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. an abnormally high body temperature.
2. any of various diseases in which high temperature is a prominent symptom, as scarlet fever or rheumatic fever.
3. intense nervous excitement: in a fever of anticipation.
4. to affect with or as if with fever.
5. to become feverish; have or get a fever.
[before 1000; Middle English; Old English fefer < Latin febris fever]
Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.