noun
cupronickel
Technical term for a copper-nickel alloy, typically around 80% copper and 20% nickel. Also called 白銅 (はくどう).
See also: 白銅
この硬貨はニッケル銅でできている。
This coin is made of cupronickel.
Synonym for cupronickel; 白銅 is a more traditional term, while ニッケル銅 explicitly mentions nickel.
Compound of ニッケル (nickel) and 銅 (copper), directly describing the alloy's composition.