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

 

antigen

 noun
noun
BrE BrE//ˈæntɪdʒən//
 
; NAmE NAmE//ˈæntɪdʒən//
 
(medical) Cell biology
 
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a substance that enters the body and starts a process that can cause disease. The body then usually produces antibodies to fight the antigens. See related entries: Cell biology Word Origin early 20th cent.: via German from French antigène (from anti- + -gen).
See the Oxford Advanced American Dictionary entry: antigen