Lewis & Short

Ossa, ae, f. (m., Ov. M. 1, 155), = Ὄσσα, a high mountain in Thessaly, now Kissovo, Mel. 2, 3, 2; Plin. 4, 8, 15, § 30: ter sunt conati imponere Pelio Ossam, Verg. G. 1, 281: Ossan, Ov. F. 1, 307.
Hence, Ossaeus, a, um, adj., Ossean: saxa, Verg. Cir. 33: rupes, Luc. 6, 334: media, Stat. Th. 2, 82: Ossaei bimembres, i. e. the Centaurs who dwell about Ossa, id. ib. 12, 554.