mesothorium
noun
meso·thorium
¦me|zō,
¦mē|,
|sō+
: 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
—symbol MsTh1 or Ra228
b
: an isotope of actinium
called also mesothorium 2
—symbol MsTh2 or Ac228Dictionary Entries Near mesothorium
Cite this Entry
“Mesothorium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mesothorium. Accessed 28 Nov. 2024.
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