pylorus

[pahy-lawr-uhs, -lohr-, pi-]
noun, plural pylori [pahy-lawr-ahy, -lohr-ahy, pi-] . Anatomy.
the opening between the stomach and the duodenum.

Origin:
1605–15; < Late Latin < Greek pylōrós literally, gatekeeper

pyloric [pahy-lawr-ik, -lor-, pi-] , adjective
postpyloric, adjective
prepyloric, adjective
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World English Dictionary
pylorus (paɪˈlɔːrəs)
 
n , pl -ri
the small circular opening at the base of the stomach through which partially digested food (chyme) passes to the duodenum
 
[C17: via Late Latin from Greek pulōrus gatekeeper, from pulē gate +ouros guardian]
 
py'loric
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pylorus py·lo·rus (pī-lôr'əs)
n. pl. py·lo·ri (-lôr'ī')

  1. The passage at the lower end of the stomach that opens into the duodenum.

  2. A muscular or myovascular structure that opens or closes an orifice or lumen of an organ.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pylorus   (pī-lôr'əs, pĭ-)  Pronunciation Key 
Plural pylori (pī-lôr'ī', pĭ-)
The passage at the lower end of the stomach that opens into the small intestine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

pylorus

cone-shaped constriction in the gastrointestinal tract that demarcates the end of the stomach and the beginning of the small intestine. The main functions of the pylorus are to prevent intestinal contents from reentering the stomach when the small intestine contracts and to limit the passage of large food particles or undigested material into the intestine.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
His pylorus often spasms which causes this vomiting.
The small intestine is a convoluted tube, extending from the pylorus to the colic valve, where it ends in the large intestine.
It is thin at the cardiac extremity, but thicker toward the pylorus.
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