Invar Hear it!

Invar definition

In·var (in′vär′)

a steel alloy containing approximately 36% nickel, used for making precision instruments and thermostatic elements because of its low coefficient of thermal expansion

Etymology: abbrev. < invariable

noun

this substance

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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