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trimetallic

[trahy-muh-tal-ik] /ˌtraɪ məˈtæl ɪk/
adjective
1.
of three metals.
2.
Engraving. (of an offset plate) consisting of a face layer of chromium, stainless steel, or chemically prepared aluminum over a layer of copper with a strengthening backup layer of steel or other metal.
Origin of trimetallic
1885-1890
1885-90; tri- + metallic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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