dross

[draws, dros]
noun
1.
waste matter; refuse.
2.
Metallurgy. a waste product taken off molten metal during smelting, essentially metallic in character.
3.
British. coal of little value.

Origin:
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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Dross is always a great word to know.
So is conservation of momentum. Does it mean:
says that for every action there is an equal and opposite reaction
law saying if there is no external force acting on a system the total momentum remains constant
Collins
World English Dictionary
dross (drɒs) [Click for IPA pronunciation guide]
 
n
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]
 
'drossy
 
adj
 
'drossiness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

dross
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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Easton
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.
To find something rewarding, the curious outsider has to plough through piles
  of dross, with little to guide him.
It's as though the elegance and ease of all our shiny screens make consumption
  of trivial dross more tasteful.
Either find gold in the dross or take out the garbage and have done with it.
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