Invar

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion. countable, uncountable
  2. 2
    an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments wordnet

Synonyms

All synonyms
alloy

Etymology

Shortening of invariable.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.