Elinvar

[ el-in-vahr ]
/ ˈɛl ɪnˌvɑr /

Trademark.

an alloy of iron, nickel, chromium, and other constituents, resistant to rust and magnetization and having a low rate of thermal expansion.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019