The story
Shortening of invariable.
Etymology from Wiktionary, CC BY-SA 4.0.
invar
Today it means: An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion. Full definition →
Today it means: An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion. Full definition →
Shortening of invariable.
Etymology from Wiktionary, CC BY-SA 4.0.