Usually means: Positive ion with four phosphorus.
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We found 17 dictionaries that define the word phosphonium:

General (15 matching dictionaries)
  1. phosphonium: Merriam-Webster
  2. phosphonium: Oxford Learner's Dictionaries
  3. phosphonium: American Heritage Dictionary of the English Language
  4. phosphonium: Collins English Dictionary
  5. phosphonium: Wordnik
  6. phosphonium: Wiktionary
  7. phosphonium: Webster's New World College Dictionary, 4th Ed.
  8. phosphonium: Infoplease Dictionary
  9. phosphonium: Dictionary.com
  10. Phosphonium: Wikipedia, the Free Encyclopedia
  11. Phosphonium: Online Plain Text English Dictionary
  12. phosphonium: Webster's Revised Unabridged, 1913 Edition
  13. Phosphonium: AllWords.com Multi-Lingual Dictionary
  14. phosphonium: FreeDictionary.org
  15. phosphonium: TheFreeDictionary.com

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

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Definitions from Wiktionary (phosphonium)

▸ noun:  (chemistry) the tetravalent positively-charged phosphorus cation R₄P⁺

Similar:
phosphenium, phosphite, phosphoranyl, tetraphenylphosphonium, phosphino, phosphinate, phosphoryl, phosphonothioate, methyltriphenylphosphonium, primary phosphine, more...

Phrases:
phosphonium iodide, more...

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Similar:
phosphenium, phosphite, phosphoranyl, tetraphenylphosphonium, phosphino, phosphinate, phosphoryl, phosphonothioate, methyltriphenylphosphonium, primary phosphine, more...

Phrases:
phosphonium iodide, more...



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