Pepsin
From BiblePortal Wikipedia
Webster's Dictionary [1]
(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.
The Nuttall Encyclopedia [2]
An essential constituent of the gastric juice extracted from the stomach of the calf, sheep, and pig, and used in medicine to supply any defect of it in the stomach of a patient.
