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Definitions

bacteria

[bak-teer-ee-uh] / bækˈtɪər i ə /
NOUN
microorganisms
Synonyms


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.

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Instead, the scientists want to understand how different foods influence the gut microbiome, the enormous community of trillions of bacteria that inhabit the digestive system.

From Science Daily ● Nov. 2, 2026

Over time, bacteria have evolved a variety of defenses to prevent these viruses from spreading.

From Science Daily ● Oct. 31, 2026

CRISPR-Cas is best known for its role in modern gene-editing technologies, but bacteria originally evolved these systems as defenses against viruses.

From Science Daily ● Oct. 31, 2026

One reason is that cranberries contain compounds called proanthocyanidins, which have anti-inflammatory properties and can interfere with the ability of certain bacteria, including E. coli, to attach to cells.

From Science Daily ● Oct. 29, 2026

The bacteria grew exponentially at first, as expected, but then paused for a while before resuming growth again.

From "The Gene" by Siddhartha Mukherjee

Although the presence of this bacterium does not automatically mean someone will develop cancer, certain strains produce a powerful toxin capable of disrupting the colon's protective lining, causing inflammation, and encouraging tumor growth.

From Science Daily ● Oct. 31, 2026

Plague is a disease caused by the Yersinia pestis bacterium, the same pathogen that killed millions of people in Europe during the Middle Ages.

From Barron's ● Oct. 7, 2026

The bacterium that causes the plague, Yersinia pestis, found among rodents such as marmots in the area.

From BBC ● Oct. 7, 2026

The bacterium Yersinia pestis, which can cause pneumonic and bubonic plague, has been identified from time to time in Siberia, linked to exposure to vermin.

From The Wall Street Journal ● Oct. 6, 2026

In 1940, an experiment on the simplest of organisms—a microscopic, capsule-shaped, gut-dwelling bacterium named Escherichia coli—provided the first crucial clue to this question.

From "The Gene" by Siddhartha Mukherjee


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