Definition of pathogen noun from the Oxford Advanced Learner's Dictionary

 

pathogen

 noun
noun
BrE BrE//ˈpæθədʒən//
 
; NAmE NAmE//ˈpæθədʒən//
 
(specialist)
 
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a thing that causes disease the spread of pathogens by insects
See the Oxford Advanced American Dictionary entry: pathogen