microorganism
noun
mi·cro·or·gan·ism
ˌmī-krō-ˈȯr-gə-ˌni-zəm 
: an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size
Examples of microorganism in a Sentence
Recent Examples on the Web
Earlier this month, Lesaffre, a French fermentation and microorganisms company, acquired DSM-Firmenich's yeast extract business.
—
Kimberly Chin, Axios, 21 Oct. 2024
Yes, plants, many animals, algae, and microorganisms all have the potential to produce melatonin and these would be considered naturally occurring sources.
—Willow Jarosh, Ms, Rd, Health, 18 Oct. 2024
This build-up provides an ideal breeding ground for microorganisms, such as the aforementioned Malassezia yeast, which doesn’t only promote dandruff, but also by-products that can irritate the scalp and cause itching.
—Philipp Wehsack, Vogue, 8 Oct. 2024
The organisms are naturally present in water and might graze on microorganisms from fecal contamination.
—Laura Baisas, Popular Science, 3 Oct. 2024
See all Example Sentences for microorganism 
Kimberly Chin, Axios, 21 Oct. 2024
Yes, plants, many animals, algae, and microorganisms all have the potential to produce melatonin and these would be considered naturally occurring sources.
—Willow Jarosh, Ms, Rd, Health, 18 Oct. 2024
This build-up provides an ideal breeding ground for microorganisms, such as the aforementioned Malassezia yeast, which doesn’t only promote dandruff, but also by-products that can irritate the scalp and cause itching.
—Philipp Wehsack, Vogue, 8 Oct. 2024
The organisms are naturally present in water and might graze on microorganisms from fecal contamination.
—Laura Baisas, Popular Science, 3 Oct. 2024
See all Example Sentences for microorganism
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'microorganism.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near microorganism
Cite this Entry
“Microorganism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microorganism. Accessed 4 Nov. 2024.
Copy CitationKids Definition
microorganism
noun
mi·cro·or·gan·ism
ˌmī-krō-ˈȯr-gə-ˌniz-əm
: an organism (as a bacterium) of microscopic or less than microscopic size
Medical Definition
microorganism
noun
mi·cro·or·gan·ism
-ˈȯr-gə-ˌniz-əm
: an organism of microscopic or ultramicroscopic size
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