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.
These particles are called bacterial extracellular vesicles, or BEVs. Panteha Torabian, The Conversation, 14 Apr. 2026 Drug resistance was defined as not responding to ampicillin, azithromycin, ceftriaxone, ciprofloxacin or trimethoprim-sulfamethoxazole, which are the antibiotics commonly used to treat bacterial infections like Shigella. Melissa Rudy, FOXNews.com, 14 Apr. 2026 If the nectar sits for too long, mold and bacterial growth will occur. Madeline Buiano, Martha Stewart, 13 Apr. 2026 The Mead Johnson fortifier used in the head-to-head clinical trial sponsored by Abbott was acidified to prevent bacterial contamination. David Hilzenrath, Miami Herald, 9 Apr. 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 21 Apr. 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

More from Merriam-Webster on bacterial

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster