base metal

any metal other than a precious or noble metal, as copper, lead, zinc, or tin. Compare noble metal, precious metal.
the principal metal of an alloy.
the principal metal of a piece underlying a coating of another metal; core. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
base metal
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
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Example sentences
They are to be demonetized as a base metal, and you know it.
Load-induced fatigue must be considered in the base metal at a welded
Base metal microstructure in unfailed leg of the elbow.
The merchandise under consideration is several types of base metal picture
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