- an enzyme, produced in the stomach, that in the presence of hydrochloric acid splits proteins into proteoses and peptones.
- a commercial form of this substance, obtained from the stomachs of hogs, used as a digestive, as a ferment in the manufacture of cheese, etc.
Origin of pepsin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pepsin
The pepsin is added to the mixture only when warm, and is injected at once.The Mother and Her Child
William S. Sadler
Also the Old Boarder who was always under the influence of Pepsin.
Now, I am going to add a pinch of pepsin to the contents in these tubes.The Woodcraft Girls at Camp
Lillian Elizabeth Roy
Synergia is claimed to be composed of pepsin, pancreatin, veg.
This is a substance distinct from pepsin, but its action is the same.Encyclopedia of Diet
- a proteolytic enzyme produced in the stomach in the inactive form pepsinogen, which, when activated by acid, splits proteins into peptones
C19: via German from Greek pepsis, from peptein to digest
Word Origin and History for pepsin
Online Etymology Dictionary, © 2010 Douglas Harper
- Any of various digestive enzymes found in gastric juice that catalyze the hydrolysis of proteins to peptides.
- A substance containing pepsin, obtained from the stomachs of hogs and calves and used as a digestive aid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- Any of various digestive enzymes found in vertebrate animals that catalyze the hydrolysis of proteins to peptides.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.