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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

So a lot of the focus is on changes to the bacterium and whether people have less immunity.

From BBC • Mar. 27, 2026

Does the explanation for its scale and speed lie solely in the bacterium itself or did other factors play a role?

From BBC • Mar. 20, 2026

The researchers found that this bacterium can enter the bloodstream and settle in breast tissue, where it triggers inflammation and early cellular changes linked to cancer.

From Science Daily • Mar. 19, 2026

A bacterium uses roughly a million bits of information—which is about 100 printed pages.

From "Cosmos" by Carl Sagan