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pestilential

[pes-tl-en-shuh l]
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adjective
  1. producing or tending to produce pestilence.
  2. pertaining to or of the nature of pestilence, especially bubonic plague.
  3. pernicious; harmful.
  4. annoyingly troublesome.
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Origin of pestilential

First recorded in 1350–1400; Middle English word from Medieval Latin word pestilentiālis. See pestilent, -ial
Related formspes·ti·len·tial·ly, adverbpes·ti·len·tial·ness, nounan·ti·pes·ti·len·tial, adjectivenon·pes·ti·len·tial, adjectiveun·pes·ti·len·tial, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for pestilential

pestilential

adjective
  1. dangerous or troublesome; harmful or annoying
  2. of, causing, or resembling pestilence
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Derived Formspestilentially, adverb
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 pestilential

adj.

late 14c., from Medieval Latin pestilentialis, from Latin pestilentia "plague" (see pestilence). Related: Pestilentially.

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Online Etymology Dictionary, © 2010 Douglas Harper

pestilential in Medicine

pestilential

(pĕs′tə-lĕnshəl)
adj.
  1. Of, relating to, or tending to produce a pestilence.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.