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constantan

[kawn-stuh n-tan] /ˈkɔn stənˌtæn/
noun
1.
an alloy containing approximately 55 percent copper and approximately 45 percent nickel, used for electrical resistance heating and thermocouples.
Origin
1900-1905
1900-05; constant + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for constantan

constantan

/ˈkɒnstənˌtæn/
noun
1.
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
Word Origin
C20: formed from constant
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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