Usually means: Radioactive element, similar to thorium.
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We found 11 dictionaries that define the word mesothorium:

General (10 matching dictionaries)
  1. mesothorium: Merriam-Webster
  2. mesothorium: American Heritage Dictionary of the English Language
  3. mesothorium: Collins English Dictionary
  4. mesothorium: Wordnik
  5. mesothorium: Wiktionary
  6. mesothorium: Webster's New World College Dictionary, 4th Ed.
  7. Mesothorium, mesothorium: Dictionary.com
  8. Mesothorium: Wikipedia, the Free Encyclopedia
  9. mesothorium: FreeDictionary.org
  10. mesothorium: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (mesothorium)

noun:  (physics) Certain members of the decay chain of thorium, mainly isotopes of radium and actinium

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