biofilm
noun
bio·film
ˌbi-(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
Recent Examples on the Web
The metal’s nanoparticles were detected inside the needles of four trees, consistently enveloped by bacterial biofilms.
—
Mrigakshi Dixit, Interesting Engineering, 10 Oct. 2025
In the thermal spring Roadside West (left) in Yellowstone National Park, researchers isolated an unusual microbe from the gray-colored biofilm (right).
—Jake Buehler, Wired News, 31 Aug. 2025
Scientists submerged individual bags of different microplastics and natural surfaces into the water and performed various tests on the resulting biofilms—running analyses on biofilm formation, metabolic activity, antibiotic resistance genes and resistance against three antibiotics.
—Marta Zaraska, Scientific American, 26 Aug. 2025
The most basic method for cleaning the toilet is to use a stiff-bristle toilet brush to physically scrub away any mineral buildup, biofilm, or staining.
—Timothy Dale, Better Homes & Gardens, 5 July 2025
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Mrigakshi Dixit, Interesting Engineering, 10 Oct. 2025
In the thermal spring Roadside West (left) in Yellowstone National Park, researchers isolated an unusual microbe from the gray-colored biofilm (right).
—Jake Buehler, Wired News, 31 Aug. 2025
Scientists submerged individual bags of different microplastics and natural surfaces into the water and performed various tests on the resulting biofilms—running analyses on biofilm formation, metabolic activity, antibiotic resistance genes and resistance against three antibiotics.
—Marta Zaraska, Scientific American, 26 Aug. 2025
The most basic method for cleaning the toilet is to use a stiff-bristle toilet brush to physically scrub away any mineral buildup, biofilm, or staining.
—Timothy Dale, Better Homes & Gardens, 5 July 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 22 Oct. 2025.
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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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