(n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). obsidian. Retrieved September 22, 2026, from http://smartdefine.org/obsidian/definitions/2038062 |
| Chicago | Webster's. 2011. "obsidian" http://smartdefine.org/obsidian/definitions/2038062 (accessed September 22, 2026). |
| Harvard | Webster's 2011, obsidian, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/obsidian/definitions/2038062>. |
| MLA | Webster's. "obsidian" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/obsidian/definitions/2038062> |