Indoxyl \In*dox"yl\, n. [Indigo + hydroxyl.] (Chem.) A nitrogenous substance, {C8H7NO}, isomeric with oxindol, obtained as an oily liquid. [1913 Webster]
Oxindol \Ox*in"dol\, n. [Oxygen + indol.] (Chem.) A white crystalline nitrogenous substance ({C8H7NO}) of the indol group, obtained by the reduction of dioxindol. It is a so-called lactam compound. [1913 Webster]