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
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The vast majority of bacteria are harmless or beneficial, even fecal ones; some experts estimate that only about one in a billion bacterial species are human pathogens. Joseph Kim, NPR, 16 June 2026 His drug abuse ultimately led to David being hospitalized with bacterial endocarditis, a disease frequently associated with substance use. Charna Flam, PEOPLE, 16 June 2026 That was partly because the software that assembled the genome from individual fragments of genome sequence was made to treat bacterial sequence as contamination. John Timmer, ArsTechnica, 16 June 2026 This rare condition, which mostly impacts children, occurs when bacterial toxins spread throughout the body and damage red blood cells, causing clots in the organs, primarily the kidneys. CNN Money, 14 June 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 19 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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