Eu`thi*o*chro"ic (?), a. [Gr. well + sulphur + color.] 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.
© Webster 1913.