Phosphonium

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Phosphonium \Phos*pho"ni*um\, n. [Phosphorus + ammonium.]
     (Chem.)
     The hypothetical radical {PH4}, analogous to ammonium, and
     regarded as the nucleus of certain derivatives of phosphine.
     [1913 Webster]