any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.
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Origin of microorganism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for micro-organic
Historical Examples of micro-organic
You see, the micro-organic world remained a mystery to the end.
“Pure prehuman and micro-organic chemistry,” Aaron broke in.The Little Lady of the Big House
The micro-organic world was an invisible world, a world we could not see, and we knew very little about it.
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
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.
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.