[draws, dros]
waste matter; refuse.
Metallurgy. a waste product taken off molten metal during smelting, essentially metallic in character.
British. coal of little value.

before 1050; Middle English dros(se), Old English drōs; cognate with Middle Dutch droes dregs; compare Middle English drōsen, Old English drōsna; cognate with Middle High German truosen husks

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dross (drɒs)
1.  the scum formed, usually by oxidation, on the surfaces of molten metals
2.  worthless matter; waste
[Old English drōs dregs; related to Old High German truosana]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. dros "dirt, dregs," from P.Gmc. *drohs- (cf. Ger. Drusen "dregs, husks"). Originally "the scum thrown off from metals in smelting." Related to O.E. dreosan "to drip."
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Dross definition

the impurities of silver separated from the one in the process of melting (Prov. 25:4; 26:23; Ps. 119:119). It is also used to denote the base metal itself, probably before it is smelted, in Isa. 1:22, 25.

Easton's 1897 Bible Dictionary
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Example sentences
The dross has been burned away and what remains is the essential character.
Compared to the dancing silhouettes, this is pure dross.
Nowhere is it written that anyone can turn water to wine, dross to gold or
  frogs into princes by following a step-by-step guide.
And the better prices may encourage others finally to consider selling their
  unwanted dross.
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