(n.) A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). gypsum. Retrieved September 23, 2026, from http://smartdefine.org/gypsum/definitions/2014387 |
| Chicago | Webster's. 2011. "gypsum" http://smartdefine.org/gypsum/definitions/2014387 (accessed September 23, 2026). |
| Harvard | Webster's 2011, gypsum, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/gypsum/definitions/2014387>. |
| MLA | Webster's. "gypsum" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/gypsum/definitions/2014387> |