n. [ Rose + aniline. ] (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. [ 1913 Webster ]
[そうはとんやがおろさない, souhatonyagaorosanai](exp) things don't work that well in the real world; things seldom go as one wishes; that is expecting too much[Add to Longdo]