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English definition of “by-product”

by-product

noun [C] uk   /ˈbaɪˌprɒd.ʌkt/ us    /-ˌprɑː.dəkt/
something that is produced as a result of making something else, or something unexpected that happens as a result of something: Buttermilk is a by-product of making butter. Illness is one of the by-products of overcrowded housing.
(Definition of by-product from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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