Biofilms are communal structures of micro-organisms that adhere to living or
inert surfaces and are encased in a protective coating secreted by them.
Bacteria living as a biofilm are able to resist to biocides and to antibiotics
more effectively than those living as free organisms and they withstand
considerably higher doses of antimicrobial products.
Antibiotics - Antimicrobial - Biocide(s) - Micro-organism
To read about this term in context:
GreenFacts Summary on Effects of Biocides on antibiotic resistance: