Lewis Short
(adjective) : pĭcĕus, a, um, pix.
* Lit., of pitch, Lucr. 6, 135.
* Transf., black as pitch, pitch-black: piceā crassus caligine,Verg. G. 2, 308: turbine fumans piceo,id. A. 3, 573: lumen,id. ib. 9, 75: nubes,Ov. M. 11, 549: caelum,Val. Fl. 2, 507: nimbus,id. 2, 115: oves,id. 3, 439: dentes,Mart. 2, 41, 7: imber piceus crassusque,Plin. 16, 33, 61, § 143: coacti aëris caligo picea,Ambros. in Luc. 7, 20.
Charlton T. Lewis, Charles Short, A Latin Dictionary