n. [ See Isatis. ] (Chem.) An orange-red crystalline substance, C8H5NO2, obtained by the oxidation of indigo blue. It is also produced from certain derivatives of benzoic acid, and is one important source of artificial indigo. [ Written also, less properly, isatine. ] [ 1913 Webster ]

{ } a. (Chem.) Pertaining to, or derived from, isatin; as, isatic acid, which is also called trioxindol. [ 1913 Webster ]