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
Researchers hope to answer these questions in a forthcoming research paper, which will also include the full genomes of the goo’s microorganisms so other scientists can build on their work, Sheik added.
—
Taylor Nicioli, CNN Money, 1 Aug. 2025
Additionally, short run times don’t allow the system to effectively remove humidity from the air, potentially causing comfort issues, material degradation, and in extreme cases promote the growth of microorganisms like mold or mildew.
—Brynn Cooksey, Forbes.com, 30 July 2025
While many of the same microorganisms that are a threat in your bathroom exist in the gym, there’s a greater risk of cross-contamination in public places, Khanna says.
—Angela Haupt, Time, 28 July 2025
High temps increase the activity of microorganisms and other factors that cause spoilage, so keeping your bananas out of heat and humidity can help increase their lifespan.
—Caroline Tien, SELF, 22 July 2025
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Taylor Nicioli, CNN Money, 1 Aug. 2025
Additionally, short run times don’t allow the system to effectively remove humidity from the air, potentially causing comfort issues, material degradation, and in extreme cases promote the growth of microorganisms like mold or mildew.
—Brynn Cooksey, Forbes.com, 30 July 2025
While many of the same microorganisms that are a threat in your bathroom exist in the gym, there’s a greater risk of cross-contamination in public places, Khanna says.
—Angela Haupt, Time, 28 July 2025
High temps increase the activity of microorganisms and other factors that cause spoilage, so keeping your bananas out of heat and humidity can help increase their lifespan.
—Caroline Tien, SELF, 22 July 2025
See All Example Sentences for microorganism
Cite this Entry
“Microorganism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microorganism. Accessed 4 Aug. 2025.
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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