Lewis & Short

furvus, a, um, adj. [akin with fuscus], dark, dusky, gloomy, swarthy, black: veteres Romani furvum atrum appellaverunt, Gell. 1, 18, 4; cf.: furvum nigrum vel atrum, Paul. ex Fest. p. 84 Müll.; and: furvum bovem id est nigrum immolabant Aterno, ib. p. 93 (poet. and in post-Aug. prose).

  1. I. Lit.: nubes, Lucr. 6, 461 Lachm. N. cr.: ex Acheronte suo furvis peperisse sub antris, Ov. M. 5, 541; so of the lower world: postis, Stat. Th. 8, 10: plagae leti, id. S. 5, 1, 155; cf. Proserpina, Hor. C. 2, 13, 21: hostiae, Val. Max. 2, 4, 5; Paul. ex Fest. p. 93 Müll.: furvā gente (i. e. Maurorum, Indorum) petita belua, Juv. 12, 104.
  2. II. Trop.: audivimus detestabili parricidio furvum diem, Sen. Contr. 1, 1 fin.: culpa, Prud. Cath. 1, 74.