base metal

noun
1.
any metal other than a precious or noble metal, as copper, lead, zinc, or tin. Compare noble metal, precious metal.
2.
the principal metal of an alloy.
3.
the principal metal of a piece underlying a coating of another metal; core.
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World English Dictionary
base metal
 
—n
any of certain common metals such as copper, lead, zinc, and tin, as distinct from the precious metals, gold, silver, and platinum

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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Base metal is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
the offspring of a zebra and a donkey.
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Example sentences
Joints shall be welded so as to minimize stress due to shrinking of the weld
  metal and adjacent base metal upon cooling.
Load-induced fatigue must be considered in the base metal at a welded
  connection.
The merchandise under consideration is several types of base metal picture
  hangers.
They are to be demonetized as a base metal, and you know it.
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