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Webster 1913 Edition
Sulphion
Sul′phi-on
,Noun.
[
Sulph
o- + 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
.]