noun [U]
1 (BrE) something of very low quality; the least valuable part of sth:
mass-produced dross * The dross churned out by some record companies isn't worth listening to. * He considered the working class to be the dross of society.
2 (technical) a waste substance, especially that separated from a metal when it is melted:
The fire burns away the dross leaving the pure metal.
