pepsin

noun
pep·​sin | \ ˈpep-sən How to pronounce pepsin (audio) \

Definition of pepsin

1 : a protease of the stomach that breaks down most proteins to polypeptides
2 : a preparation containing pepsin that is obtained from the stomach especially of the hog and is used especially as a digestive aid

Examples of pepsin in a Sentence

Recent Examples on the Web Even that function is carried out by proteins like pepsin. Nathan Ahlgren, The Conversation, 13 Jan. 2021 In 2012, a lab study showed that water with a pH of 8.8 neutralized pepsin, the enzyme that causes damage to the esophagus in people with acid reflux. SELF, 6 Sep. 2018 That’s because plant protein is digested mostly in the intestines, while animal protein is digested in the stomach—which is also the point of production for pepsin. Alice Park, Time, 7 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pepsin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of pepsin

circa 1844, in the meaning defined at sense 1

History and Etymology for pepsin

German, from Greek pepsis digestion, from pessein

Keep scrolling for more

Learn More About pepsin

Time Traveler for pepsin

Time Traveler

The first known use of pepsin was circa 1844

See more words from the same year

Statistics for pepsin

Cite this Entry

“Pepsin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pepsin. Accessed 24 Jul. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for pepsin

pepsin

noun
pep·​sin | \ ˈpep-sən How to pronounce pepsin (audio) \

Kids Definition of pepsin

: an enzyme that starts the digestion of proteins in the stomach

pepsin

noun
pep·​sin | \ ˈpep-sən How to pronounce pepsin (audio) \

Medical Definition of pepsin

1 : a crystallizable protease that in an acid medium digests most proteins to polypeptides (as by dissolving coagulated egg albumin or causing casein to precipitate from skim milk), that is secreted by glands in the mucous membrane of the stomach of higher animals, and that in combination with dilute hydrochloric acid is the chief active principle of gastric juice
2 : a preparation containing pepsin obtained as a powder or scales from the stomach especially of the hog and used especially as a digestant

More from Merriam-Webster on pepsin

Britannica.com: Encyclopedia article about pepsin

WORD OF THE DAY

Test Your Vocabulary

Difficult Spelling Words Quiz

  • alphabet pasta spelling help
  • Which is the correct spelling?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!