Etymology

Elinvar

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Today it means: A nickel–iron–chromium alloy notable for having a modulus of elasticity which does not change much with temperature. Full definition →

French élasticité invariable
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The story

  1. French · derived fromélasticité invariable“invariable elasticity”
  2. English todayElinvar

From French élasticité invariable (“invariable elasticity”).

Etymology from Wiktionary, CC BY-SA 4.0.