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

     

    by-product

     noun
    noun
    BrE BrE//ˈbaɪ prɒdʌkt//
     
    ; NAmE NAmE//ˈbaɪ prɑːdʌkt//
     
     
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  1. 1a substance that is produced during the process of making or destroying something else When burnt, plastic produces dangerous by-products.
  2. 2a thing that happens, often unexpectedly, as the result of something else One of the by-products of unemployment is an increase in crime.