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Definition:
A class of natural or man-made substances, such as penicillin, that kill or
inhibit the growth of some micro-organisms.
Source & ©: GreenFacts, based on
Glossary 
More:
Antibiotics are widely used as medication against disease-causing bacteria.
However, bacteria can aquire resistance to particular antibiotics through
mutation.
Antibiotics are not effective against viruses.
Source & ©: GreenFacts
To read about this term in context: GreenFacts Digest on Genetically Modified Crops:
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