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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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In particular, they’re examining how bacteria from diseased gums, and the immune response they trigger, may contribute to conditions including heart disease, diabetes, cognitive decline, arthritis, respiratory disease and chronic liver disease.

From The Wall Street Journal Jul. 26, 2026

A big challenge is dental plaque, a protective structure known as a biofilm that helps bacteria adhere to teeth and makes them more resistant to removal by saliva, mouth rinses and some antimicrobial agents.

From The Wall Street Journal Jul. 26, 2026

Inulin is a prebiotic, which means it provides nourishment for beneficial gut bacteria.

From Science Daily Jul. 25, 2026

Testing environments need to be treated like biocontainment labs, where a virus or bacteria could otherwise escape into the world, Lohn said.

From Barron's Jul. 24, 2026

Leeuwenhoek was the first to see single-celled microorganisms, tiny plants and tiny animals, including bacteria.

From "Phineas Gage" by John Fleischman

Some governments also use Wolbachia, a naturally occurring bacterium found in about half of all insect species, to curb the spread of mosquito-borne diseases like dengue.

From BBC Jul. 23, 2026

The bacterium appears to fight cancer through two complementary mechanisms.

From Science Daily Jul. 10, 2026

Infant botulism happens when swallowed spores from the bacterium infect a baby’s large intestine and make a toxin in it.

From Los Angeles Times Jun. 14, 2026

Only two decades ago, it was widely doubted by specialists that the Black Death was caused by the bacterium Yersinia pestis, the agent of the bubonic plague.

From The Wall Street Journal Jun. 12, 2026

Reed favored the idea that a bacterium, first identified by Italian scientists and usually found in swamps, was the culprit.

From "An American Plague: The True and Terrifying Story of the Yellow Fever Epidemic of 1793" by Jim Murphy




Vocabulary lists containing bacteria


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