Lewis & Short

† ŏnychĭnus, a, um, adj., = ὀνύχινος.

  1. I. Of the color of the finger-nail, nail-colored: pira, Plin. 15, 15, 16, § 55: pruna, Col. 12, 10.
  2. II. Of the marble called onyx: lapis, Vulg. Gen. 2, 12.
    As subst.: onychinus, the onyx, Vulg. Exod. 39, 13.
    Transf., resembling the onyx (poet.) of the coating of ice on rivers: tegimen onychinum, Laev ap. Gell. 19, 7 fin.
    Subst.:     ŏnychĭna (sc. vasa), n. plur., vessels of onyx, Lampr. Heliog. 32.