Meaning
An alloy of iron containing 35.5% nickel, and having a very low coefficient of expansion.
Etymology
Origin: Unknown
Shortening of invariable.
Synonyms & Antonyms
Synonyms
NYT Puzzle Appearances
No published puzzle dates on file for this word yet. It is part of the official NYT Spelling Bee word list for 2019, 2020, 2023, 2025.