Invar

American  

[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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Invar British  

/ ɪnˈvɑː /

noun

1. 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

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Etymology

Origin of Invar

C20: shortened from _invariable

Example Sentences

Take Invar, and allow of nickel and iron.

From BBC

They found that Questar telescopes—used by hobbyists for more than half a century—fit the space perfectly, so they ordered a couple of custom ones fashioned out of Invar, a thermally stable nickel-iron alloy.

From Science Magazine

Invar, a nickel-steel alloy, which also has an extremely small coefficient of expansion, is used in making clock pendulums, which are unaffected by change of temperature.

From Project Gutenberg

Invar's knife found her heart, and she sank back dead.

From Project Gutenberg

I hope the meal was with you this day, thirty-five bolls,—for it was at Invar last night.

From Project Gutenberg