Dross (?), n. [AS. dros, fr. dreosan to fall. See Dreary.]
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.
Rust of metals.
[R.]
Addison.
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.
© Webster 1913.