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Invar

[in-vahr] /ɪnˈvɑr/
Trademark.
1.
a brand of iron alloy containing 35.5 percent nickel and having a very low coefficient of expansion at atmospheric temperatures.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Invar

Invar

/ɪnˈvɑː/
noun
1.
trademark an alloy containing iron (63.8 per cent), nickel (36 per cent), and carbon (0.2 per cent). It has a very low coefficient of expansion and is used for the balance springs of watches, etc
Word Origin
C20: shortened from invariable
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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