pylorus noun. [pʌɪ'lɔ:rǝs] Pl. -ri [-rʌɪ]. E17.
[Late Latin from Greek pulōros, pulouros gatekeeper, from pulē gate + ouros warder.]
1. Anatomy. The opening from the stomach into the duodenum, controlled by a strong sphincter muscle. Also, the adjacent part of the stomach. E17.

2. Zoology. An analogous part in an invertebrate, e.g. the posterior opening of the stomach in an insect. E19.

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