Waste or impure matter: discarded the dross after recycling the timber pulp.
The scum that types on top of molten material because of oxidation.
Worthless, commonplace, or insignificant matter: "He was wide-awake and his brain worked plainly, purged of all of the dross” ( Vladimir Nabokov).
Waste or impure matter
Worthless or trivial matter
Residue that forms on top of a metal from oxidation
The impurities in material
A waste item from working with material
The scum or refuse matter that will be thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement.
Rust of metals.
waste material; any useless matter separated from better component; leavings; dregs; refuse.
Refuse or impure or international matter which distinguishes from a liquid and drops into bottom or rises toward top, as with wine or oil or in molten steel; sediment; lees; dregs; scum; any refuse or waste material, as chaff; specially, and today chiefly, the slag, scales, or cinders thrown removed from molten material.
In galvano-elect., an alloy of zinc and iron formed into the zinc-bath, partly by the solvent activity associated with zinc on the metal for the cooking pot, but mainly from the metal articles dipped, and from the leaking off of the superfluous amalgam as they come from the bathtub.
Figuratively, a worthless thing; the valueless remainder of a once respected thing.
worthless or dangerous material that needs to be removed
the scum formed by oxidation at the surface of molten metals