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- Dictionaryby-product/ˈbʌɪˌprɒdʌkt/
noun
- 1. an incidental or secondary product made in the manufacture or synthesis of something else: "zinc is a by-product of the glazing process"
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noun
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Unwanted secondary product of a production process, manufacturing process or chemical reaction
A by-product or byproduct is a secondary product derived from a production process, manufacturing process or chemical reaction; it is not the primary product or service being produced. Wikipedia