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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  
/ ˌmaɪkrəʊˌbaɪəˈlɒdʒɪkəl, 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-ŏlə-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:

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

This is where her doctor - Dr Brendan Healy, a consultant in infectious diseases and microbiology - believes she picked up the infection.

From BBC Jun. 30, 2026

Gustavo Palacios, a professor of microbiology at the Icahn School of Medicine Mount Sinai in New York City, says most human-to-human transmission involves close contact among family members or healthcare providers treating infected patients.

From The Wall Street Journal May 16, 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

Each of the three microbiology experiments asked a different kind of question, but in all cases a question about Martian metabolism.

From "Cosmos" by Carl Sagan

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