# biofilm

> English word · Noun · frequency rank #54,646

## Definitions
1. A thin film of mucus created by and containing a colony of bacteria and other microorganisms.

## Etymology
From bio- + film. First used in the early 1970s in the context of wastewater treatment.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/biofilm