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Definition of Invar
1. Noun. An alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments.
Definition of Invar
1. Noun. an alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion. ¹
¹ Source: wiktionary.com
Definition of Invar
1. an iron-nickel alloy [n -S]