Euthiochroic \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.

Source: Webster's Revised Unabridged Dictionary (1913)