radiothorium Hear it!

radiothorium definition

radio·tho·rium (rā′dē ō t̸hôr′ē əm)

noun

a radioactive isotope of thorium, of mass number 228, formed from mesothorium 2

Etymology: ModL

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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