[fee-bruhl, feb-ruhl or, esp. British, fee-brahyl]
pertaining to or marked by fever; feverish.

1645–55; < Neo-Latin, Medieval Latin febrīlis. See fever, -ile

febrility [fi-bril-i-tee] , noun
nonfebrile, adjective
postfebrile, adjective
unfebrile, adjective
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World English Dictionary
febrile (ˈfiːbraɪl)
of or relating to fever; feverish
[C17: from medical Latin febrīlis, from Latin febris fever]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1650s, from M.L. febrilis "pertaining to fever," from L. febris "a fever" (see fever).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

febrile feb·rile (fěb'rəl, fē'brəl)
Of, relating to, or characterized by fever; feverish.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And the national political climate was becoming more febrile and polarized.
During two of my kids' febrile seizures, they stopped breathing for awhile.
For such a humdrum country, the debate is surprisingly febrile.
In this febrile mix, the tales about the source of some rumours sound almost as
  fanciful as the rumours themselves.
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