The Collaborative International Dictionary
Indigotic
Indigotic \In`di*got"ic\, a. [Cf. F. indigotique.] (Chem.) Pertaining to, or derived from, indigo; as, indigotic acid, which is also called anilic or nitrosalicylic acid.
Wiktionary
indigotic
a. (context chemistry English) Pertaining to, or derived from, indigo.