Sär'do-nyx, n.

n. [Lat. sardonyx, Gr. σαρδόνυξ, from Σάρδιος, Sardian, or Σαρδώος, Sardinian, and ὄνυξ, a nail, a veined gem; It. sardonico, Sp. sardónique, sardonica, sardonic; Pr. sardogne, Fr. sardoine.] (Min.) A silicious stone or gem, nearly allied to onyx, of a reddish-yellow, or nearly orange color.