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mesothorium

[ mez-oh-thawr-ee-uhm, -thohr-, mes-, mee-zoh-, -soh- ]

noun

, Chemistry.
  1. one of two radioactive decay products of thorium, an isotope of radium or actinium.

mesothorium

/ ˌmɛsəʊˈθɔːrɪəm /

noun

  1. obsolete.
    physics either of the two radioactive elements which are decay products of thorium. Mesothorium I is now called radium-228. Mesothorium II is now called actinium-228

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