Definition of "by-product" []

• A secondary product; something made incidentally during the production of something else. (noun)
• A side effect. (noun)

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• "Human beings come into the world with a predisposition to believe in supernatural phenomena — and this predisposition is a by-product of cognitive functioning gone awry"
• "Microsilica is a by-product of the production of silicon and ferrosilicon alloys for the IT industry and, as such, does not constitute a big detrimental effect on the environment."
• "A not-so-quiet war is waged daily on Facebook by nearly three-quarters of a million social networkers passionately engaged around the dark brown, salty, 109-year-old British yeast by-product food spread known as Marmite."