microorganism

[mahy-kroh-awr-guh-niz-uhm]
noun
any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.

Origin:
1875–80; micro- + organism

microorganic [mahy-kroh-awr-gan-ik] , microorganismal, adjective
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World English Dictionary
microorganism (ˌmaɪkrəʊˈɔːɡəˌnɪzəm)
 
n
any organism, such as a bacterium, protozoan, or virus, of microscopic size

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

microorganism
1880, coined in Eng. from micro- + organism.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
microorganism   (mī'krō-ôr'gə-nĭz'əm)  Pronunciation Key 
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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Example sentences
He had identified the microorganism that causes a form of pneumonia in humans.
The genomics gold rush revolves around genes that have been isolated and purified outside an animal, plant or microorganism.
The antibody and other parts of the immune system destroy and eliminate the invading microorganism.
Yeast is the microorganism that is responsible for fermentation in beer.
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