byproduct

n. secondary product, something which is obtained from the manufacture of a different product; result of another action

A by-product is a secondary or incidental product deriving from a manufacturing process, a chemical reaction or a biochemical pathway, and is not the primary product or service being produced. A by-product can be useful and marketable, or it can have severe ecological consequences.
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Noun
1. a secondary and sometimes unexpected consequence
(synonym) by-product
(hypernym) consequence, effect, outcome, result, event, issue, upshot
(hyponym) epiphenomenon
2. a product made during the manufacture of something else
(synonym) by-product, spin-off
(hypernym) product, production

Byproduct is (1) any radioactive material (except special nuclear material) yielded in, or made radioactive by, exposure to the radiation incident to the process of producing or using special nuclear material (as in a reactor); and (2) the tailings or wastes produced by the extraction or concentration of uranium or thorium from ore (see 10 CFR 20.1003).

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