Definition of by- prefix from the Oxford Advanced Learner's Dictionary

     

    by-

     prefix
    (also bye-)prefix
    BrE BrE//baɪ//
     
    ; NAmE NAmE//baɪ//
     
    (in nouns)
     
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  1. 1less important a by-product
  2. 2near a bystander
See the Oxford Advanced American Dictionary entry: by-