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
This device emits radiation that damages the cells of microorganisms like bacteria and mold—keeping the coil and interior components clean.
—
Matt Fuchs, Time, 12 June 2025
What Molasses Does in the Garden Molasses’ power in the garden lies in its ability to feed beneficial microorganisms in the soil that play a vital role in plant health.
—Leanne Potts, Better Homes & Gardens, 11 June 2025
Rich in microorganisms and volatile organic compounds, the woodland environment strengthens the immune system, enhances brain function, and lifts our mood.
—Emese MacZko, Forbes.com, 10 June 2025
In one small study, adults with obesity who drank black tea kombucha for eight weeks had an improved balance of beneficial gut microorganisms compared to normal-weight adults.5
Immunity and the gut microbiome: Kombucha may enhance immune system health.
—Melissa Nieves, Verywell Health, 9 June 2025
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Matt Fuchs, Time, 12 June 2025
What Molasses Does in the Garden Molasses’ power in the garden lies in its ability to feed beneficial microorganisms in the soil that play a vital role in plant health.
—Leanne Potts, Better Homes & Gardens, 11 June 2025
Rich in microorganisms and volatile organic compounds, the woodland environment strengthens the immune system, enhances brain function, and lifts our mood.
—Emese MacZko, Forbes.com, 10 June 2025
In one small study, adults with obesity who drank black tea kombucha for eight weeks had an improved balance of beneficial gut microorganisms compared to normal-weight adults.5
Immunity and the gut microbiome: Kombucha may enhance immune system health.
—Melissa Nieves, Verywell Health, 9 June 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 17 Jun. 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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