Euchroic \Eu*chro"ic\, a. [Gr. ? well-colored; e'y^ well + ?
color.] (Chem.)
Having a fine color.
[1913 Webster]
{Euchroic acid} (Chem.), an organic, imide acid, obtained as
a colorless crystalline substance, {C12H4N2O8} by heating
an ammonium salt of mellitic acid. By reduction it is
changed to a dark blue substance (euchrone), -- hence its
name.
[1913 Webster]