protium Hear it!

protium definition

pro·tium (prōt′ē əm, prō′s̸hē-)

noun

the most common isotope of hydrogen, H, having a mass number of 1

Etymology: ModL: see proto- & -ium

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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