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pepsin

[pep-sin] /ˈpɛp sɪn/
noun, Biochemistry
1.
an enzyme, produced in the stomach, that in the presence of hydrochloric acid splits proteins into proteoses and peptones.
2.
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.
Also, pepsine.
Origin
1835-1845
1835-45; < Greek péps(is) digestion (pep-, base of péptein to digest + -sis -sis) + -in2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pep-sine

pepsin

/ˈpɛpsɪn/
noun
1.
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 pep-sine

pepsin

n.

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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pep-sine in Medicine

pepsin pep·sin or pep·sine (pěp'sĭn)
n.

  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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pep-sine in Science
pepsin
  (pěp'sĭn)   
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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