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.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.