Secondary products created when making something else, often less valuable than the main product but still useful or profitable.
Formed from 'by-' (alongside, secondary) and 'product' (something produced), literally meaning products made 'by' the process rather than as the main goal. Common in industrial chemistry and manufacturing since the 19th century.
Some of history's most important discoveries were byproducts—the pharmaceutical industry was born because chemists realized dyes they made accidentally while creating other chemicals could cure diseases, turning waste into wealth.
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