phosphonium

noun
phos·​pho·​ni·​um | \fäs-ˈfō-nē-əm \

Definition of phosphonium 

: a monovalent cation PH4+ analogous to ammonium and derived from phosphine also : an organic derivative of phosphonium (such as (C2H5)4P+)

First Known Use of phosphonium

1859, in the meaning defined above

History and Etymology for phosphonium

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The first known use of phosphonium was in 1859

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phosphonium

noun
phos·​pho·​ni·​um | \fäs-ˈfō-nē-əm \

Medical Definition of phosphonium 

: a monovalent cation PH4+ analogous to ammonium and derived from phosphine also : an organic derivative of phosphonium (as (C2H5)4P+)

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