An incidental or secondary product made in the manufacture or synthesis of something else; something produced as a result of making something else, often unintended but potentially valuable.
Compound word combining 'by' (meaning secondary or incidental) and 'product,' first used in the 19th century during industrial development. Originally referred to secondary materials from manufacturing processes, later expanded to any incidental result.
Some of history's greatest discoveries were byproducts - penicillin was a byproduct of messy lab work, and Post-it Notes were a byproduct of failed super-strong adhesive research, showing how 'failures' can become more valuable than original goals!
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