nī^gror — Lewis & Short
nī^gror, ōris, m.1. niger,
I blackness (poet. and in post-Aug. prose): noctis, Pac. ap. Cic. Div. 1, 14, 24; Lucil. ap. Non. 515, 5:
mortis,Lucr. 3, 39:
nigrorem in ulceribus excitat,Cels. 2, 1:
rubidus est rufus, atrore et nigrore multo mixtus,Gell. 2, 26, 14.