Lewis & Short

Sīla, ae, f., a large forest in the country of the Bruttii, which yielded great quantities of pitch, Cic. Brut. 22, 85; Sall. Fragm. ap. Serv. Verg. A. 12, 715 (H. 4, 7 Dietsch); Plin. 3, 5, 10, § 74; Verg. G. 3, 219; id. A. 12, 715.
Hence, Sīlānus, a, um, adj., of or belonging to the forest of Sila: caseus, Cassiod. Var. 12, 12.

1. Sīlānus, i, m., a Roman surname in the Julian gens, Liv. 23, 15; 25, 2.

      1. a. D. Junius Silanus, Cic. Fin. 1, 7, 24; id. Off. 2, 16, 57; id. Cat. 4, 4, 7; Sall. C. 50, 4; 51, 16.
      2. b. M. Silanus, Cic. Brut. 35, 135; id. Fan 10, 30. 1.
        Hence, Sīlānĭānus, a, um, adj., of or named from one Silanus: senatusconsultum, Dig. 29, 5, 1, §§ 7 and 21.

2. sīlānus, i, m., = σιληνός, Doric σιλανός, a fountain or jet of water (usually spirting from a head of Silenus). Lucr. 6, 1265; Cels. 3, 18 med.; Fest. s. v. tullios, p. 352 Müll.; Inscr. Orell. 3321; Hyg. Fab. 169.

3. Sīlānus, v. Sila fin.