One of the mysteries of the English language finally explained.
A hard alloy of copper, zinc, and iron, used (especially formerly) in gun-making and marine engineering.
Mid 19th century; earliest use found in Chemical News. From the genitive of the name of Johann Aich, Austrian naval officer, who invented the alloy, for which a British patent was subsequently issued (3 Feb. 1860) + metal, after German Aichmetall. In some forms from the name of Johann Aich + metal.
Aich's metal/ˈeɪks ˌmɛt(ə)l/
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