n. [ L. nigrificare to blacken; niger black + -ficare (in comp.) to make. See -fy. ] The act or process of making black. [ R. ] Johnson. [ 1913 Webster ]
n. [ L. niger black: cf. F. nigrine. ] (Min.) A ferruginous variety of rutile. [ 1913 Webster ]
a. (Ethnol.) Pertaining to, or having the characteristics of, negroes, or of the Negritos, Papuans, and the Melanesian races; negritic. [ Webster 1913 Suppl. ]
n. [ L. nigritudo, fr. niger black. ] Blackness; the state of being black. Lamb. [ 1913 Webster ]
n. [ From NL. Sinapis nigra. ] (Chem.) A glucoside found in the seeds of black mustard (Brassica nigra, formerly Sinapis nigra) It resembles sinalbin, and consists of a potassium salt of myronic acid. [ 1913 Webster ]