The Collaborative International Dictionary
Indoaniline
Indoaniline \In`do*an"i*line\, n. [Indigo + aniline.] (Chem.) Any one of a series of artificial blue dyes, in appearance resembling indigo, for which they are often used as substitutes.
Wiktionary
indoaniline
n. (context chemistry English) Any of a series of artificial blue dyes used as substitutes for indigo.