micro organism

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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