rosaniline

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A brownish-red crystalline organic compound, C₂₀H₂₁N₃O, derived from aniline and used in the manufacture of dyes and in Schiff's reagent.

Century Dictionary and Cyclopedia

1. n. An organic base (C₂₀H₂₁N₃O), a derivative of aniline, crystallizing in white needles, capable of uniting with acids to form salts, which are the well-known rosaniline coloring matters of commerce; also, the color thus produced. Thus, fuchsin is the monohydrochlorid and azalein the nitrate of rosaniline. Silk and wool dipped into aqueous solutions of any of the salts withdraw them from solution and become dyed at once. Cotton, on the other hand, does not withdraw the coloring matter, but must be first treated with a mordant of some animal substance, such as albumen. Also called aniline red, roseine, magenta, azalein.

Wiktionary

1. n. An organic base, C20H19N3, used to make the dye fuchsine
2. n. The deep red or magenta colour of fuchsine (rosaniline hydrochloride).

GNU Webster's 1913

1. n. (Chem.) A complex nitrogenous base, C20H21N3O, obtained by oxidizing a mixture of aniline and toluidine, as a colorless crystalline substance which forms red salts. These salts are essential components of many of the socalled aniline dyes, as fuchsine, aniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper.