1) Alloy 1) Copper-base alloy 
Cupronickel or copper-nickel is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. Cupronickel is highly resistant to corrosion in seawater, because its electrode potential is adjusted to be neutral with regard to seawater. Because of this, it is used for piping, heat exchangers and condensers in seawat...
any of an important group of alloys of copper and nickel; the alloy containing 25 percent nickel is used by many countries for coins. Because copper ...
[n] - a 60/40 alloy of copper and nickel
cupronickel A corrosion-resistant alloy of copper containing up to 40 percent nickel.
An alternative term for copper-nickel alloy.
Obsolete term for copper-nickel alloy.
noun a 60/40 alloy of copper and nickel
Copper alloy (75% copper and 25% nickel), used in hardware products and for coinage
any of various alloys of copper containing up to 40 percent nickel.