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- Copyright was a by-product of the renaissance .
- They're the by-product of an acquisitive society, refuse, that's all .
- There's just a child that has to be born, the by-product of good nights in milan .
- Useful drugs are made from inorganic substances or are plant and animal by-product .
- In a sense, output from leys in the form of milk and meat is a by-product of tillage farming .
A by-product is a secondary product derived from a manufacturing process or chemical reaction. It is not the primary product or service being produced.