mesothorium Hear it!

mesothorium definition

meso·tho·rium (-t̸hôr′ē əm)

noun

  1. a radioactive isotope of radium (mesothorium 1), formed from thorium
  2. a radioactive isotope of actinium (mesothorium 2), formed from this isotope of radium

Etymology: ModL: see meso- & thorium

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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