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Definitions

bacterium

[bak-teer-ee-uhm] / bækˈtɪər i əm /






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.

Flea-borne typhus is caused by the bacterium Rickettsia typhi.

From Los Angeles Times • Apr. 3, 2026

Small mutations can have a big impact on the behaviour of the bacterium.

From BBC • Mar. 20, 2026

An initial genetic analysis of the bacterium causing the outbreak was concluded on Thursday.

From BBC • Mar. 20, 2026

These techniques allowed the scientists to determine how the MraZ transcription factor attaches to the promoter of the dcw operon in the bacterium Mycoplasma genitalium.

From Science Daily • Mar. 14, 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