(n.) Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). onyx. Retrieved September 21, 2026, from http://smartdefine.org/onyx/definitions/2038883 |
| Chicago | Webster's. 2011. "onyx" http://smartdefine.org/onyx/definitions/2038883 (accessed September 21, 2026). |
| Harvard | Webster's 2011, onyx, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/onyx/definitions/2038883>. |
| MLA | Webster's. "onyx" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/onyx/definitions/2038883> |