What do a.m. and p.m. stand for?

base metal

any metal other than a precious or noble metal, as copper, lead, zinc, or tin.
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. 2015.
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Examples from the web for base metal
  • 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 connection.
  • base metal microstructure in unfailed leg of the elbow.
  • The merchandise under consideration is several types of base metal picture hangers.
  • Joints shall be welded so as to minimize stress due to shrinking of the weld metal and adjacent base metal upon cooling.
British Dictionary definitions for base metal

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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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