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From: Webster's Revised Unabridged Dictionary (1913)

 Eu·thi·o·chro·ic a.  Chem. Pertaining to, or denoting, an acid so called.
 Euthiochroic acid Chem., a complex derivative of hydroquinone and sulphonic (thionic) acid. -- so called because it contains sulphur, and forms brilliantly colored (yellow) salts.
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