trimetallic [trahy-muh-tal-ik] WORD ORIGIN adjective of three metals. 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. Liberaldictionary.com
Origin of trimetallic First recorded in 1885–90; tri- + metallic Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019