(n.) An unorganized proteolytic ferment or enzyme contained in the secretory glands of the stomach. In the gastric juice it is united with dilute hydrochloric acid (0.2 per cent, approximately) and the two together constitute the active portion of the digestive fluid. It is the active agent in the gastric juice of all animals.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). pepsin. Retrieved September 24, 2026, from http://smartdefine.org/pepsin/definitions/2043566 |
| Chicago | Webster's. 2011. "pepsin" http://smartdefine.org/pepsin/definitions/2043566 (accessed September 24, 2026). |
| Harvard | Webster's 2011, pepsin, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/pepsin/definitions/2043566>. |
| MLA | Webster's. "pepsin" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/pepsin/definitions/2043566> |