(n.) A siliceous stone, a variety of quartz, closely resembling flint, but more brittle; -- called also chert.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). hornstone. Retrieved September 21, 2026, from http://smartdefine.org/hornstone/definitions/2017367 |
| Chicago | Webster's. 2011. "hornstone" http://smartdefine.org/hornstone/definitions/2017367 (accessed September 21, 2026). |
| Harvard | Webster's 2011, hornstone, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/hornstone/definitions/2017367>. |
| MLA | Webster's. "hornstone" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/hornstone/definitions/2017367> |