phosphonium From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounThe tetravalent positively-charged phosphorus cation R4P+ Related wordsSynonymsphospheniumphosphitephosphoranyltetraphenylphosphoniumphosphinophosphinatephosphorylphosphonothioatemethyltriphenylphosphoniumprimary phosphinephosphoranephosphonitesecondary phosphinediphosphitephosphidephosphonic acid References Wiktionary — phosphonium Wikipedia — phosphonium