-oxindol-

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 ]

n. [ Pref. di- + oxygen + indol. ] (Chem.) A white, crystalline, nitrogenous substance obtained by the reduction of isatin. It is a member of the indol series; -- hence its name. [ 1913 Webster ]