Usually means: Selenium analog of an oxonium.
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We found 10 dictionaries that define the word selenonium:

General (9 matching dictionaries)
  1. selenonium: Merriam-Webster
  2. selenonium: Wordnik
  3. selenonium: Wiktionary
  4. Selenonium, selenonium: Dictionary.com
  5. Selenonium: Online Plain Text English Dictionary
  6. selenonium: Webster's Revised Unabridged, 1913 Edition
  7. Selenonium: AllWords.com Multi-Lingual Dictionary
  8. selenonium: FreeDictionary.org
  9. Selenonium: TheFreeDictionary.com

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

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Definitions from Wiktionary (selenonium)

▸ noun:  (chemistry) The univalent H₃Se⁺ cation, derived from selane.

Similar:
selenite, selenous acid, selenone, hydroselenide, phenylselenide, selenenyl, selenocyanic acid, selenate, selenyl, selenonic acid, more...

Types:
tellurium, polonium, astatine, radon, francium, more...

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Similar:
selenite, selenous acid, selenone, hydroselenide, phenylselenide, selenenyl, selenocyanic acid, selenate, selenyl, selenonic acid, more...

Types:
tellurium, polonium, astatine, radon, francium, more...



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