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Definition of dross:

  1. Rust of metals.
  2. The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement.
  3. Waste matter; any worthless matter separated from the better part; leavings; dregs; refuse.

Synonyms:

scoria, slag, impurity, impureness, garbage, waste, trash.

Usage examples: