microorganism
any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.
Origin of microorganism
1Other words from microorganism
- mi·cro·or·gan·ic [mahy-kroh-awr-gan-ik], /ˌmaɪ kroʊ ɔrˈgæn ɪk/, mi·cro·or·gan·is·mal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use microorganism in a sentence
There are other infective diseases, in which we have not yet found the causative micro-organism, but we presume its existence.
Essays In Pastoral Medicine | Austin MalleyWe do not know the cause of yellow fever despite the claims of Sanarelli that he has isolated the specific micro-organism.
Essays In Pastoral Medicine | Austin MalleyThis test is that it cannot be infected again for a long time, if at all, by the same micro-organism.
Darwinism and Race Progress | John Berry HaycraftThis he also proved to be caused by a minute form of life, and that fowl cholera is due to still another form of micro-organism.
Famous Men and Great Events of the Nineteenth Century | Charles MorrisIf I can keep the specific micro-organism that causes hog-cholera off my place, I need not fear the disease.
The Fat of the Land | John Williams Streeter
British Dictionary definitions for microorganism
/ (ˌmaɪkrəʊˈɔːɡəˌnɪzəm) /
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
Scientific definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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