pot metal

pot metal

noun
1.
an alloy of copper and lead, formerly used for making plumbing fixtures, bearings, etc.
2.
cast iron of a quality suitable for making pots.
3.
a low-grade nonferrous alloy used for die casting.
4.
Glassmaking.
a.
glass colored by being mixed with stained glass during fusion.
b.
glass melted in a pot.

Origin:
1685–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pot metal

noun
1. cast iron used for making cooking wares 
2. an alloy of copper and lead used especially for making large pots 
WordNet® 3.0, © 2006 by Princeton University.
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