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Entry 3 senses Webster, 1913

Dross

/(drŏs; 115)/ · IPA /dɹɔs/
01 n. The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement.
  1. 1.
    The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement.
  2. 2.
    Rust of metals.[R.]
  3. 3.
    Waste matter; any worthless matter separated from the better part; leavings; dregs; refuse.
    “All world's glory is but dross unclean.” — Spenser.
    “At the devil's booth are all things sold, Each ounce of dross coats its ounce of gold.” — Lowell.