by-product noun
by-prod·uct | \ ˈbī-ˌprä-(ˌ)dəkt \
variants: or byproduct
plural by-products or byproducts
Definition of by-product
1 : something produced in a usually industrial or biological process in addition to the principal product
Sulfured molasses is a by-product of sugar refining.
The demand for soybeans is currently tied to global meat consumption and is expected to grow, fuelled by Asia.
… the soybean has become an important source of human and animal protein, with 85% of its cultivation destined for animal feed and the remaining destined for direct human consumption.