See also: byproduct
- Homophone: biproduct
by-product (plural by-products)
- A secondary product; something made incidentally during the production of something else.
- 1911, “History of English Agriculture”, in 1911 Encyclopædia Britannica:
- It was about this time that the first experiments were made (in Germany) with basic slag, a material which had hitherto been regarded as a worthless by-product of steel manufacture. A year or two later field trials were begun in England, with the final result that basic slag has become recognized as a valuable source of phosphorus for growing crops, and is now in constant demand for application to the soil as a fertilizer.
- A side effect.
- The many Indian restaurants all over Britain are a by-product of the large waves of immigration from the subcontinent.