a microorganism, especially a pathogenic bacterium.

1880–85; < French < Greek mīkro- micro- + bíos life

microbeless, adjective
microbial, microbic, microbian, adjective
nonmicrobic, adjective
unmicrobial, adjective
unmicrobic, adjective
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World English Dictionary
microbe (ˈmaɪkrəʊb)
any microscopic organism, esp a disease-causing bacterium
[C19: from French, from micro- + Greek bios life]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

popular name for a bacterium, 1868, from Fr. microbe, "badly coined ... by Sédillot" [Weekley] from Gk. mikros "small" + bios "life" (see bio-). Incorrect use of bios; in Gk. the word would mean lit. "short-lived."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

microbe mi·crobe (mī'krōb')
A microorganism, especially a bacterium that causes disease; a minute life form. No longer in technical use.

mi·cro'bi·al (mī-krō'bē-əl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
microbe   (mī'krōb')  Pronunciation Key 
A microorganism, especially a bacterium that causes disease. See Note at germ.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In the case of bacteria, the polymer seems to work by gouging holes in a microbe's cell wall and spilling out its contents.
Rous was cautious, hesitant to claim that the microbe causing cancer in
  chickens was a virus.
Also noteworthy, this is not the only common microbe found in humans having
  genes which can manipulate host neurotransmitters.
For a microbe already adapted to one species to adapt to another can be
  difficult and require a lot of evolutionary time.
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