invar

Noun
  1. An alloy of iron and nickel having a low coefficient of thermal expansion;
    Used in tuning forks and measuring tapes and other instruments (synset 114945552)
    domain usage: trademark - a formally registered symbol identifying the manufacturer or distributor of a product
    is a type of: alloy, metal - a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten

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