from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A polypeptide hormone produced in the duodenum, especially on contact with acid, to stimulate secretion of pancreatic juice.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A peptide hormone, secreted by the duodenum, that serves to regulate its acidity
from The Century Dictionary and Cyclopedia
- n. A peculiar substance which is derived from the mucous membrane of the intestinal tract and, after absorption into the blood-current, stimulates the pancreas and possibly also the salivary glands to secretion. The substance is supposedly present in the epithelial cells of the intestinal mucosa in an inactive form which is termed prosecretin. Of its chemical nature nothing is known, but it appears certain that secretin is not a ferment.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a gastrointestinal hormone that stimulates the secretion of water and bicarbonate from the pancreas and bile ducts whenever the stomach empties too much acid into the small intestine
secret(ion)1 + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)