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From: Webster's Revised Unabridged Dictionary (1913)

 I·seth·i·on·ic a.    Chem. Pertaining to, derived from, or designating, an acid, HO.C2H4.SO3H, obtained as an oily or crystalline substance, by the action of sulphur trioxide on alcohol or ether. It is derivative of sulphuric acid.
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