bio·​film | \ ˌbi-(ˌ)ō-ˈfilm How to pronounce biofilm (audio) \

Definition of biofilm

: 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 Based on the tissue samples, these sensors can detect an infection hours before a biofilm sets in—by the time populations reach that 1 million mark, the indicator would have turned green. Max G. Levy, Wired, 23 Feb. 2022 This plaque is an accumulation of bacteria, fungi and viruses that live together in a community known as a microbial biofilm. Josefine Hirschfeld, CNN, 19 Nov. 2021 Some biofilm probably has been present on the memorial’s marble surface from its early years. Washington Post, 22 Oct. 2021 This process, never before attempted on this scale, reduced the pigmented biofilm to a fine ash. Washington Post, 22 Oct. 2021 Bogan picked up a rock dotted with snails, which were grazing on the slimy biofilm of microbes. Ian James,, 8 Sep. 2021 After a few weeks of pouring water over the sand, a gooey biofilm formed on top. Jonathan Schifman, Popular Mechanics, 8 Aug. 2021 Newer technology replaces this regeneration zone with a smaller, self-contained, plantless biofilter, which uses material such as lava rock and gravel to build up a biofilm. Karen Bruno, WSJ, 23 June 2021 The bacteria in biofilm can cause some pretty nasty, hard-to-treat breakouts, Dr. Soleymani says. Amy Marturana Winderl, SELF, 11 June 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'biofilm.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of biofilm

1975, in the meaning defined above

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The first known use of biofilm was in 1975

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Cite this Entry

“Biofilm.” Dictionary, Merriam-Webster, Accessed 6 Jul. 2022.

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More Definitions for biofilm


bio·​film | \ ˈbī-ō-ˌfilm How to pronounce biofilm (audio) \

Medical Definition of biofilm

: 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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