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MESOTHORIUM

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mes⋅o⋅tho⋅ri⋅um

  [mez-oh-thawr-ee-uhm, -thohr-, mes-, mee-zoh-, -soh-]
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–noun Chemistry.
one of two radioactive decay products of thorium, an isotope of radium or actinium.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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mes·o·tho·ri·um   (měz'ə-thôr'ē-əm, -thōr'-, měs'-)   
n.  Either of two decay products of thorium, mesothorium I, an isotope of radium, or mesothorium II, an isotope of actinium.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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