From Longman Dictionary of Contemporary EnglishRelated topics: Industryby-productˈby-ˌproduct, byproduct /ˈbaɪˌprɒdʌkt $ -ˌprɑː-/ noun [countable]1TIsomething additional that is produced during a natural or industrial processby-product ofa by-product of oil refining2RESULTan unplanned additional result of something that you doby-product ofJob losses are an unfortunate byproduct of the recession. →end productExamples from the Corpusby-product• Some theories may be such that behaviour that follows them is also neutral as a by-product.• How people feel about facts is a by-product.• Such experiences are not accidentalby-products of complicatedphysicalstructures.• Another by-product of spaceexploration is a growing awareness of this planet's fragileenvironment.• That was Jack's introduction to tinnitus, the head noises which are a deeply distressingby-product of some forms of deafness.• Turquoise, originally considered a mereby-product of coppermining, was vigorously promoted by Waddell's father, B.C.• Law itself is the by-product of custom built up by habit.• One of the by-products of the peacetreaty was the growth of trade between the two nations.• The cakes themselves are unintended by-products of the recipes.From Longman Business Dictionaryby-productˈby-ˌproduct (also byproduct) noun [countable]1MANUFACTURINGsomething produced during the process of making something else, especially during an industrial processBran is a byproduct of the milling process.2something unexpected or unplanned that happens as a result of something else happeningThe fiscal crisis is a byproduct of the recession.