By-product

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by-product

[′bī‚präd·əkt]
(engineering)
A product from a manufacturing process that is not considered the principal material.

By-product

Material, other than the principal product, generated as a consequence of an industrial process or as a break-down product in a living system.
References in periodicals archive ?
We are now fully self-sufficient in heat energy generation as the bio heating plant generates all the heat and steam needed at the Korkeakoski sawmill from its own side products, says Sami Kotivuori, Mill Director, UPM Korkeakoski sawmill.
A factual feature on the costs and (in)efficiency and environmental wrecking side products of what should be confined to some miscellany of silly Victorian inventions?
Contract award: coffee and side products and making coffee machines.
One of the nicest side products of the installation is it allows me to lay guns across the wheel wells now with some support underneath.