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dross (noun) waste or worthless material sticking to a metal; something of a very low quality or least useful.
The useless material sticking to a metal when it is melted is dross. The ore from which a metal is obtained consists of the metal and certain impurities which are useless and are to be separated from the metal. Such impurities and useless material are called dross. We obtain aluminum from bauxite by separating the metal from the dross, that is, the impurities sticking to it. Anything of low quality and least useful is also dross. A boring movie is so much of dross. The uninteresting news stories and the gossip columns in some of the magazines are all dross because they are of no use.
- True, we are able to obtain metals in their pure forms, but separating them from the dross which just deserves to be thrown away as it is useless, is a laborious process.
- The speeches at the convention were just dross. The speakers had nothing new or useful to tell us and it was just a waste of time.