Mesothorium meaning

mĕz'ə-thôr'ē-əm, mĕs'-
Either of two decay products of thorium, mesothorium I, an isotope of radium, or mesothorium II, an isotope of actinium.
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A radioactive isotope of radium (mesothorium 1), formed from thorium.
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A radioactive isotope of actinium (mesothorium 2), formed from mesothorium 1
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(physics) Any product of the radioactive decay of thorium, mainly isotopes of radium and actinium.
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