trimetallic

[trahy-muh-tal-ik]
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:
1885–90; tri- + metallic

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Example sentences
We synthesized magnetic spinel ferrites from trimetallic single-source precursors.
Some metal salts are generated in the etching of bimetallic and trimetallic offset printing plates.
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