from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An onyx with alternating brown and white bands of sard and other minerals.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A gemstone having bands of red sard; a variety of onyx or chalcedony.
from the GNU version of the Collaborative International Dictionary of English
- n. A variety of onyx consisting of sard and white chalcedony in alternate layers.
from The Century Dictionary and Cyclopedia
- n. A chalcedony or agate consisting of two or more layers of brown or red combined with white or other color. Since about 1870 the name has been given to a chalcedony stained with various shades of red to deep brown.
- n. In heraldry, a tincture, the color murrey or sanguine, when blazoning is done by precious stones.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an onyx characterized by parallel layers of sard and a different colored mineral
Middle English sardonix, probably from Latin sardonyx, from Greek sardonux : sardion, sard; see sard + onux, onyx, nail; see nogh- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)