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: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.