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An alloy of 45 percent nickel and 55 percent copper, used chiefly in electrical instruments because of its constant resistance under variations of temperature.
(Metallurgy) an alloy of copper (60 per cent) and nickel (40 per cent). It has a high resistivity that does not vary significantly with temperature and is used in resistors and, with copper, in thermocouples
[C20: formed from constant]
an alloy containing approximately 55 percent copper and 45 percent nickel, used for electrical resistance heating and thermocouples.
[1900–05; constant + -an]