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or pepsine

[pep-sin] /ˈpɛp sɪn/
noun, Biochemistry.
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
1835-45; < Greek péps(is) digestion (pep-, base of péptein to digest + -sis -sis) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for pepsin


a proteolytic enzyme produced in the stomach in the inactive form pepsinogen, which, when activated by acid, splits proteins into peptones
Word Origin
C19: via German from Greek pepsis, from peptein to digest
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pepsin

also pepsine, fermin in gastric juice, used medicinally for cases of indigestion, 1844, coined in German (Theodor Schwann, 1835) from Greek pepsis "digestion," from stem pep- (see peptic) + -in (2).

Online Etymology Dictionary, © 2010 Douglas Harper
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pepsin in Medicine

pepsin pep·sin or pep·sine (pěp'sĭn)

  1. Any of various digestive enzymes found in gastric juice that catalyze the hydrolysis of proteins to peptides.

  2. 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.
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pepsin in Science
Any of various digestive enzymes found in vertebrate animals that catalyze the hydrolysis of proteins to peptides.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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