Lewis & Short

pĭcĕus, a, um, adj. [pix].

  1. I. Lit., of pitch, Lucr. 6, 135.
  2. II. 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.