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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.

Keep Reading on Vocabulary.com

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:

Miranda Keith, a supervisor in Quest’s microbiology laboratory in Lenexa, Kansas, took a break from her supervisory duties last week to work 10-hour shifts examining stool samples at the company’s St. Louis lab.

From The Wall Street Journal Aug. 5, 2026

But plaque can shed bacteria or bacterial products into the bloodstream, says Dr. George Hajishengallis, a professor at the University of Pennsylvania’s dental school specializing in microbiology and immunology.

From The Wall Street Journal Jul. 26, 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

“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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