noun
- Acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). Obsidian. Retrieved September 22, 2026, from http://smartdefine.org/obsidian/definitions/1248693 |
| Chicago | WordNet. 2010. "Obsidian" http://smartdefine.org/obsidian/definitions/1248693 (accessed September 22, 2026). |
| Harvard | WordNet 2010, Obsidian, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/obsidian/definitions/1248693>. |
| MLA | WordNet. "Obsidian" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/obsidian/definitions/1248693> |