Source : Webster's Revised Unabridged Dictionary (1913)

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 has not yet been isolated.