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microorganism

[mahy-kroh-awr-guh-niz-uh m] /ˌmaɪ kroʊˈɔr gəˌnɪz əm/
noun
1.
any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.
Origin of microorganism
1875-1880
1875-80; micro- + organism
Related forms
microorganic
[mahy-kroh-awr-gan-ik] /ˌmaɪ kroʊ ɔrˈgæn ɪk/ (Show IPA),
microorganismal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for microorganisms
Contemporary Examples
Historical Examples
  • All such very small plants and animals are known as microorganisms.

    General Science Bertha M. Clark
  • The virulence is not great enough to kill a sufficiently high percentage of rats that eat food containing the microorganisms.

    House Rats and Mice David E. Lantz
  • Phagocytosis: the destruction or devouring of bacteria or other microorganisms by phagocytes.

  • The passage of microorganisms through the digestive tract of Blaberus craniifer mounted under controlled conditions.

  • The destructive effect of microorganisms both in the interior of the cheese and upon its surface is rapid.

    The Book of Cheese Charles Thom and Walter Warner Fisk
  • It exerts an inhibitive action upon the growth of microorganisms, but irritates the tissues.

  • Some microorganisms are transmitted directly from one animal to another, and the diseases produced may be called contagious.

    Special Report on Diseases of Cattle U.S. Department of Agriculture
  • When the infected egg is eaten raw the microorganisms, if present, are communicated to man and may cause disease.

    The Dollar Hen Milo M. Hastings
British Dictionary definitions for microorganisms

microorganism

/ˌmaɪkrəʊˈɔːɡəˌnɪzəm/
noun
1.
any organism, such as a bacterium, protozoan, or virus, of microscopic size
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
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microorganisms in Medicine

microorganism mi·cro·or·gan·ism (mī'krō-ôr'gə-nĭz'əm)
n.
An organism of microscopic or submicroscopic size, especially a bacterium or protozoan.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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microorganisms in Science
microorganism
  (mī'krō-ôr'gə-nĭz'əm)   
An organism that can be seen only with the aid of a microscope and that typically consists of only a single cell. Microorganisms include bacteria, protozoans, and certain algae and fungi. See Note at germ.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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microorganisms in Culture

microorganisms definition


Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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