SO4

1 definition found

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

  Sulphion \Sul"phi*on\, n. [Sulpho- + ion.] (Chem.)
     A hypothetical radical, {SO4}, regarded as forming the acid
     or negative constituent of sulphuric acid and the sulphates
     in electrolytic decomposition; -- so called in accordance
     with the binary theory of salts. [Written also {sulphione}.]
     [1913 Webster]