Lewis & Short

ossĕus, a, um, adj. [2. os],

  1. I. of bone, bone- (post Aug.): cuneus, Col. 5, 11: cultelli, Plin. 12, 25, 54, § 115.
  2. II. Like bone, hard as bone, bony: manus, Juv. 5, 53: ilex, Plin. 16, 38, 73, § 186: cutis, Cassiod. Var. 10, 30.