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trimetallic

[trahy-muh-tal-ik]
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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.
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Origin of trimetallic

First recorded in 1885–90; tri- + metallic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018