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
Antimicrobial resistance occurs when the microorganisms that cause infections become resistant to antibiotics and antifungals, according to the Mayo Clinic.
—
Sabienna Bowman, Peoplemag, 16 May 2024
Composting Process: Solid waste begins to decompose inside the composting chamber, aided by aerobic bacteria and microorganisms that break down the waste into compost.
—Debbie Wolfe, Popular Science, 15 May 2024
See all Example Sentences for microorganism 
Sabienna Bowman, Peoplemag, 16 May 2024
Composting Process: Solid waste begins to decompose inside the composting chamber, aided by aerobic bacteria and microorganisms that break down the waste into compost.
—Debbie Wolfe, Popular Science, 15 May 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.
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Cite this Entry
“Microorganism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microorganism. Accessed 29 May. 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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