microorganism

[ mahy-kroh-awr-guh-niz-uh m ]
/ ˌmaɪ kroʊˈɔr gəˌnɪz əm /

noun

any organism too small to be viewed by the unaided eye, as bacteria, protozoa, and some fungi and algae.

Nearby words

  1. micronodular,
  2. micronucleate,
  3. micronucleus,
  4. micronutrient,
  5. micronychia,
  6. microorganisms,
  7. micropalaeontology,
  8. micropaleontology,
  9. microparasite,
  10. micropathology

Origin of microorganism

First recorded in 1875–80; micro- + organism

Related formsmi·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. 2019

Examples from the Web for microorganism


British Dictionary definitions for microorganism

microorganism

/ (ˌmaɪkrəʊˈɔːɡəˌnɪzəm) /

noun

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

Medicine definitions for microorganism

microorganism

[ mī′krō-ôrgə-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.

Science definitions for microorganism

microorganism

[ mī′krō-ôrgə-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.