0 a substance of no value or use that is made during a process in which something useful is produced:
Cadmium is a toxic waste product of the electronics industry.
1 a material or substance with no use or value that is produced when products are being made:
The waste product from a hydrogen car is pure water and nothing else.
Taking into account the composition of the waste stream, and in particular the low recycling rate and the toxicity of the waste product.
The main waste product in the production of titanium dioxide is sulphuric acid.
In this instance, the soil that adheres to the sugar beet during processing is a waste product and must be disposed of in some way.
However, it has simply been a waste product and, therefore, it has been used and people are pleased that is has been used.
It is a major contract and one way of using a waste product that otherwise has very little use.
But we want to avoid waste, because it is the waste product of insecticides which is causing the difficulty.
It has not, therefore, come from this waste product but from some other cause.
