mesothorium
nounDefinition of mesothorium
: either of two radioactive products intermediate between thorium and radiothorium in the thorium series or a mixture of the two products obtained usually from thorium minerals (as monazite sand) and used as a substitute for radium especially in luminous paints:
a
: an isotope of radium
— called also
mesothorium 1
b
: an isotope of actinium
— called also
mesothorium 2
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