Lewis & Short

saxōsus (collat. form saxŭōsus, Sicul. Fl. p. 11 Goes.), a, um, adj. [saxum], full of rocks or stones, rocky, stony: montes, Verg. G. 2, 111: valles, id. E. 5, 84: loca, Col. Arb. 21, 1: mare, id. ib. 8, 16, 8: Hypanis, Verg. G. 4, 370: Euphrates, Plin. 5, 24, 20, § 84: frutex, growing among stones, id. 15, 7, 7: Phlegethon saxosa incendia torquet, Sil. 13, 565.
As subst.: saxōsa, ōrum, n., rocky or stony places: piscium genera alia planis gaudent, alia saxosis, Quint. 5, 10, 21 (cf.: saxatiles pisces, under saxatilis): herba in saxosis nascens, Plin. 21, 29, 103, § 175.