Indophenol \In`do*phe"nol\, n. [Indigo + phenol.] (Chem.)
Any one of a series of artificial blue dyestuffs, resembling
indigo in appearance, and obtained by the action of phenol on
certain nitrogenous derivatives of quinone. Simple indophenol
proper, the parent compound of the dye series, is a
quinonimine derivative with the formula {C12H9NO2}.
[1913 Webster +PJC]