Pronunciation: (trī"mu-tal'ik), [key]
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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.