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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Our study helps resolve this paradox by providing evidence that scratching also provides defense against bacterial skin infections. Teresa Mull, FOXNews.com, 4 July 2026 Legionnaires is a bacterial pneumonia caused by the bacteria legionella, which grows in warm water. Thomas Tracy, New York Daily News, 4 July 2026 The result was a menu of skin complaints – fungal, bacterial and otherwise. Katherine Ott, The Conversation, 2 July 2026 Signs Your Oral Microbiome Is Out of Balance Persistent bad breath that does not resolve with brushing is one of the most common early signs of bacterial imbalance. Allison Palmer, Fort Worth Star-Telegram, 2 July 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

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Cite this Entry

“Bacterial.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bacterial. Accessed 5 Jul. 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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