chalcedony
n. நீலச்சாயருலுடைய வெண்ணிற மணிக்கல் வகை.
Chal*ced"o*ny, n.; pl. Chalcedonies. Etym: [ L. chalcedonius, fr. Gr. calcédoine, OE. calcidoine, casidoyne. Cf. Cassidony.] (Min.) Defn: A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.] Note: When chalcedony is variegated with with spots or figures, or arranged in differently colored layers, it is called agate; and if by reason of the thickness, color, and arrangement of the layers it is suitable for being carved into cameos, it is called onyx. Chrysoprase is green chalcedony; carnelian, a flesh red, and sard, a brownish red variety.