constantan

[kawn-stuhn-tan]

con·stant·an

[kawn-stuhn-tan]
noun
an alloy containing approximately 55 percent copper and approximately 45 percent nickel, used for electrical resistance heating and thermocouples.

Origin:
1900–05; constant + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Constantan is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a scrap or morsel of food left at a meal.
Collins
World English Dictionary
constantan (ˈkɒnstənˌtæn)
 
n
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]

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