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cu·pro·nick·el | \ ˌkyü-prō-ˈni-kəl 
, ˌkü- \
, ˌkü- \Definition of cupronickel
: an alloy of copper and nickel especially : one containing about 70 percent copper and 30 percent nickel
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Time Traveler for cupronickel
The first known use of cupronickel was in 1900
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