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Definition of: pepsin
(pep′sin) noun
1. Biochem. A proteolytic enzyme secreted by the gastric juices of the stomach.
2. A medicinal preparation obtained from the stomachs of various animals, as the pig and the calf, used to aid digestion.
3. A similar enzyme found in the cells of certain plants. Also pep′sine. [<G <Gk. pepsis digestion <peptein digest]
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