(n.) A crystalline substance (C5H5N5O) contained in guano. It is also a constituent of the liver, pancreas, and other glands in mammals.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). guanin. Retrieved September 26, 2026, from http://smartdefine.org/guanin/definitions/2014002 |
| Chicago | Webster's. 2011. "guanin" http://smartdefine.org/guanin/definitions/2014002 (accessed September 26, 2026). |
| Harvard | Webster's 2011, guanin, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/guanin/definitions/2014002>. |
| MLA | Webster's. "guanin" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/guanin/definitions/2014002> |