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English definition of “pathogen”

pathogen

noun [C] uk   /ˈpæθ.ə.dʒən/ us  
any small organism, such as a virus or a bacterium that can cause disease: a dangerous pathogenBacteria, moulds, germs and viruses
pathogenic
adjective uk   /ˌpæθ.əˈdʒen.ɪk/ us  
Bacteria, moulds, germs and viruses
(Definition of pathogen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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