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From: Webster's Revised Unabridged Dictionary (1913)

 Eth·i·on·ic a.  Chem. Pertaining to, derived from, or designating, an acid so called.
 Ethionic acid Chem., a liquid derivative of ethylsulphuric and sulphuric (thionic) acids, obtained by the action of sulphur trioxide on absolute alcohol.
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