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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