Invar

Invar

[in-vahr]
Trademark.
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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Invar (ɪnˈvɑː)
 
n
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
 
[C20: shortened from invariable]

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