elinvar

noun

el·​in·​var

ˈelə̇nˌvär

plural -s

: an alloy that contains about 50 percent iron, 36 percent nickel, and 12 percent chromium, that has low thermal expansivity and a modulus of elasticity virtually unaffected by changes in temperature, and that is used for springs for watches and other precise instruments

Word History

Etymology

French élinvar, from élasticité invariable invariable elasticity

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