The Collaborative International Dictionary
Nigraniline
Nigraniline \Ni*gran"i*line\ (? or ?), n. [L. niger black + E. aniline.] (Chem.) The complex, nitrogenous, organic base and dyestuff called also aniline black.
Wiktionary
nigraniline
n. (context organic chemistry English) A complex, nitrogenous, organic base and black dyestuff