Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The opening in a vertebrate, including humans, at the lower end of the stomach that opens into the duodenum.
  • n. A muscular or myovascular structure that controls the opening of an orifice or lumen of an organ.

from the GNU version of the Collaborative International Dictionary of English

  • n. The opening from the stomach into the intestine.
  • n. A posterior division of the stomach in some invertebrates.

from The Century Dictionary and Cyclopedia

  • n. In the early church, a doorkeeper; an ostiary (which see).
  • n. In anatomy: The orifice of communication between the stomach and the intestine, by which the contents of the stomach pass into the intestine.
  • n. The fold of mucous membrane, containing muscular fibers, which guards the pyloric orifice, or other contrivance for retarding or opposing the passage of food from the stomach into the intestine.
  • n. The pyloric end or division of the stomach.
  • n. In Hydrozoa, a valvular structure which separates the gastric from the somatic cavity in the siphonophorous hydrozoans.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a small circular opening between the stomach and the duodenum

Etymologies

Late Latin pylōrus, from Greek pulōros : pulē, gate + ouros, guard; see wer-3 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin, from πυλωρός (pulōros, "gatekeeper"). (Wiktionary)

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