biofilm
noun
bio·film
ˌbī-(ˌ)ō-ˈfilm 
: a thin usually resistant layer of microorganisms (such as bacteria) that form on and coat various surfaces
Examples of biofilm in a Sentence
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The new discovery adds to the growing assortment of bioelectrical phenomena that scientists have discovered playing out beyond the nervous system, from bacteria swapping signals within a biofilm to cells following electric fields during embryonic development.
—
Elise Cutts, Quanta Magazine, 12 Jan. 2026
These include the ability to form sticky biofilms that anchor them to surfaces, robust DNA repair mechanisms to counter radiation damage, and the capacity to form tough, dormant spores that endure even the most punishing conditions.
—Mrigakshi Dixit, Interesting Engineering, 2 Jan. 2026
Just outside the plant, the investigator found processing waste and stagnant water coated with a green biofilm, attracting a swarm of bugs too numerous to count.
—Annie Waldman, ProPublica, 30 Dec. 2025
This problem usually begins in hidden crevices in seals and gaskets, but this nasty biofilm can eventually spread and make your dishwasher unsanitary.
—Brandee Gruener, Southern Living, 10 Dec. 2025
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Elise Cutts, Quanta Magazine, 12 Jan. 2026
These include the ability to form sticky biofilms that anchor them to surfaces, robust DNA repair mechanisms to counter radiation damage, and the capacity to form tough, dormant spores that endure even the most punishing conditions.
—Mrigakshi Dixit, Interesting Engineering, 2 Jan. 2026
Just outside the plant, the investigator found processing waste and stagnant water coated with a green biofilm, attracting a swarm of bugs too numerous to count.
—Annie Waldman, ProPublica, 30 Dec. 2025
This problem usually begins in hidden crevices in seals and gaskets, but this nasty biofilm can eventually spread and make your dishwasher unsanitary.
—Brandee Gruener, Southern Living, 10 Dec. 2025
See All Example Sentences for biofilm
Cite this Entry
“Biofilm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/biofilm. Accessed 14 Jan. 2026.
Copy CitationMedical Definition
biofilm
noun
bio·film
ˈbī-ō-ˌfilm
: a thin usually resistant layer of microorganisms (as bacteria) that form on and coat various surfaces (as of catheters or water pipes)
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