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microbiology

American  
[mahy-kroh-bahy-ol-uh-jee] / ˌmaɪ kroʊ baɪˈɒl ə dʒi /

noun

  1. the branch of biology dealing with the structure, function, uses, and modes of existence of microscopic organisms.


microbiology British  
/ ˌmaɪkrəʊbaɪˈɒlədʒɪ /

noun

  1. the branch of biology involving the study of microorganisms

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

microbiology Scientific  
/ mī′krō-bī-ŏl′ə-jē /
  1. The scientific study of microorganisms.


Other Word Forms


Etymology

Origin of microbiology

First recorded in 1885–90; micro- + biology


Compare meaning

How does microbiology compare to similar and commonly confused words? Explore the most common comparisons:


Explanation

Microbiology is the study of very small things, both living and nonliving. If you're fascinated by looking at tiny organisms through a microscope, you should take a class in microbiology. If your job involves microbiology, you're probably a microbiologist, a scientist who studies microorganisms and other microscopic things. Notice the prefix micro- in all of those words? It means "extremely small," from the Greek root mikros, "small or slight." Add this to biology, "the science of living things," and you get microbiology. This branch of science involves looking closely at fungi, viruses, parasites, bacteria, and other microbes.

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Vocabulary lists containing microbiology

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Sullivan, a professor of biology and virology, immunology & microbiology at Boston University, explains that bringing an outbreak under control depends on several measures working quickly together.

From Science Daily ● Sep. 20, 2026

Developing the treatment required scientists from several disciplines to work together, including specialists in microbiology, synthetic biology, oncology, and immunology.

From Science Daily ● Aug. 19, 2026

Study co-author Dr Chris Williamson, associate professor in polar microbiology, emphasised that this "hidden diversity" highlights that further samples are needed.

From BBC ● Jun. 30, 2026

“These viruses are also what are called ‘low incidence, high consequences,’” said Robert Cross, a hantavirus researcher and assistant professor of microbiology and immunology at the University of Texas Medical Branch at Galveston.

From MarketWatch ● May 7, 2026

It is too soon to say that all the Viking microbiology results can be explained by inorganic chemistry, but such a result would no longer be surprising.

From "Cosmos" by Carl Sagan

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