Also found in: Thesaurus, Encyclopedia, Wikipedia.
(Metallurgy) 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
[C20: shortened from invariable]
Switch to new thesaurus
|Noun||1.||Invar - an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments|
trademark - a formally registered symbol identifying the manufacturer or distributor of a product