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

Recent Examples on the Web

Heavy black mold like biofilm and bacterial slime residue were found inside the ice machine. — Veronica Fernandez-Alvarado july 24, Sacbee.com, 24 July 2026

Doctors say hotel coffee makers can develop bacterial biofilms because warm, moist interiors are difficult to clean thoroughly. — Joey Skladany, Travel + Leisure, 30 June 2026

The air conditioner cooling systems at the Bellevue hotel in 1976 hosted such biofilms. — Robert Promisloff, The Conversation, 19 June 2026

The maggots are thought to secrete various antibacterial compounds to ward off pathogenic bacteria and block biofilms from forming, overall preventing secondary infection. — Beth Mole, ArsTechnica, 17 June 2026

Word History

First Known Use

1975, in the meaning defined above

Rhymes for biofilm

• film
• microfilm

Medical 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)