Lewis & Short

Cĭthaeron (Cĭthĕron, Aus. Idyll. 11, 32), ōnis, m., = Κιθαιρών, a mountain of Bœotia, now Elatia, sacred to Bacchus and the Muses, and famous for the death of Pentheus and Actœon, Mel. 2, 3, 4; Plin. 4, 7, 12, § 25; Verg. G. 3, 43; id. A. 4, 303; Ov. M. 2, 223; 3, 702 sq.; Sen. Oedip. 930; id. Phoen. 256; Val. Fl. 5, 81 (in all these passages only in nom.).
Gen. Cithaeronis, Prop. 3 (4), 1, 43; 3 (4), 15, 25; Liv. 31, 26, 1.
Acc. Cithaeronem, Lact. 1, 22, 15; Serv. ad Verg. A. 7, 641; 10, 163; id. G. 3, 291.