Usually means: Historical name for thorium-230 isotope.
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We found 13 dictionaries that define the word ionium:

General (9 matching dictionaries)
  1. ionium: Merriam-Webster
  2. ionium: Collins English Dictionary
  3. ionium: Wordnik
  4. ionium: Wiktionary
  5. ionium: Webster's New World College Dictionary, 4th Ed.
  6. ionium: The Wordsmyth English Dictionary-Thesaurus
  7. ionium: Infoplease Dictionary
  8. ionium: Dictionary.com
  9. ionium: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. ionium: Encyclopedia

Medicine (3 matching dictionaries)
  1. ionium: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Ionium: Medical dictionary

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Definitions from Wiktionary (ionium)

▸ noun:  (physics) The isotope of thorium ²³⁰₉₀Th

Similar:
thorium emanation, thorium, thorinum, thorin, radiothulium, thorite, uranium-233, thorianite, thoria, thallium, more...

Adjectives:
pure, separate, unsupported, excess, pan

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Similar:
thorium emanation, thorium, thorinum, thorin, radiothulium, thorite, uranium-233, thorianite, thoria, thallium, more...

Adjectives:
pure, separate, unsupported, excess, pan



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