UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪnˈvɑː/US:USA pronunciation: respellingUSA pronunciation: respelling(in vär)

WordReference Random House Unabridged Dictionary of American English © 2020
In•var  (in vär),USA pronunciation [Trademark.]
  1. Metallurgy, Trademarksa brand of iron alloy containing 35.5 percent nickel and having a very low coefficient of expansion at atmospheric temperatures.

Collins Concise English Dictionary © HarperCollins Publishers::
Invar /ɪnˈvɑː/ n
  1. trademark an alloy containing iron (63.8 per cent), nickel (36 per cent), and carbon (0.2 per cent). It has a very low coefficient of expansion and is used for the balance springs of watches, etc
Etymology: 20th Century: shortened from invariable
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