bacterial

adjective

bac·​te·​ri·​al bak-ˈtir-ē-əl How to pronounce bacterial (audio)
: of, relating to, or caused by bacteria
bacterial infection
bacterially adverb

Examples of bacterial in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Key Takeaways Eating late at night and being stressed can worsen gut problems such as constipation, diarrhea, and reduced gut bacterial diversity. Jennifer Klump, Verywell Health, 1 June 2026 The Lifeform spawns from a black, bacterial mold that infests the yellow wallpaper and moist carpets. Dani Di Placido, Forbes.com, 31 May 2026 The Nicaraguan government issued a statement Sunday saying that Rivera died from a bacterial infection after his health had declined following a case of COVID-19, which led to his physical and neurological deterioration. ABC News, 31 May 2026 The insects can carry Pierce’s disease, a bacterial infection that is often fatal to grapevines, according to the USDA. Don Sweeney, Sacbee.com, 31 May 2026 See All Example Sentences for bacterial

Word History

First Known Use

1869, in the meaning defined above

Time Traveler
The first known use of bacterial was in 1869

Browse Nearby Words

Cite this Entry

“Bacterial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bacterial. Accessed 7 Jun. 2026.

Kids Definition

bacterial

adjective
bac·​te·​ri·​al bak-ˈtir-ē-əl How to pronounce bacterial (audio)
: of, relating to, or caused by bacteria

Medical Definition

bacterial

adjective
bac·​te·​ri·​al bak-ˈtir-ē-əl How to pronounce bacterial (audio)
: of, relating to, or caused by bacteria
a bacterial chromosome
bacterial infection
bacterial endocarditis
bacterially adverb

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