pestiferous

[pe-stif-er-uhs]
adjective
1.
bringing or bearing disease.
3.
pernicious; evil.
4.
Informal. mischievous; troublesome or annoying.

Origin:
1425–75; late Middle English < Latin pestiferus plague-bringing, equivalent to pesti- (stem of pestis) pest + -ferus -ferous

pestiferously, adverb
pestiferousness, noun
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World English Dictionary
pestiferous (pɛˈstɪfərəs)
 
adj
1.  informal troublesome; irritating
2.  breeding, carrying, or spreading infectious disease
3.  corrupting; pernicious
 
[C16: from Latin pestifer, from pestis contagious disease, pest + ferre to bring]
 
pes'tiferously
 
adv
 
pes'tiferousness
 
n

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

pestiferous
1458, mischievous, pernicious, fig. use of L. pestiferus "that brings plague or destruction," variant of pestifer "bringing plague," from pestis "plague" + ferre "carry" (see infer).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pestiferous pes·tif·er·ous (pě-stĭf'ər-əs)
adj.

  1. Producing or breeding infectious disease.

  2. Infected with or contaminated by an epidemic disease.

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
In online environments, they are both popular and pestiferous, the cause of constant comment and debate.
Pupal parasitoids were among the earliest described natural enemies of pestiferous fruit flies.
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