Definition of microorganism
: an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size
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Recent Examples of microorganism from the Web
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And what if microorganisms did, in fact, exist on Mars billions of years ago?
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That leaves open the possibility that microorganisms once populated our planetary neighbor and still might.
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High-quality compost is teeming with life, full of beneficial microorganisms that will help improve your soil life and your plants' vitality.
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The number of outbreaks caused by Legionella increased 14 percent per year, according to the CDC report, but only accounted for 3 percent of the 363 identified microorganism outbreaks.
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The microorganisms that usually live there won't thrive in sunlight.
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While living in a mother’s womb, cushioned by amniotic fluid and protected from the outside world, babies have only minimal exposure to microorganisms like bacteria and viruses.
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DasSarma has studied one of these microorganisms and created the Purple Earth hypothesis.
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And perhaps more important, as plants pull carbon from the air, their roots inject some of it into the soil, feeding microorganisms and fungi called mycorrhiza.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'microorganism.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of microorganism
International Scientific Vocabulary
MICROORGANISM Defined for English Language Learners
Definition of microorganism for English Language Learners
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biology : an extremely small living thing that can only be seen with a microscope
MICROORGANISM Defined for Kids
Definition of microorganism for Students
: a living thing (as a bacterium) that can only be seen with a microscope
Medical Dictionary
Learn More about microorganism
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Spanish Central: Translation of microorganism Nglish: Translation of microorganism for Spanish speakers Britannica.com: Encyclopedia article about microorganism
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