rectum

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rectum:

see intestineintestine,
muscular hoselike portion of the gastrointestinal tract extending from the lower end of the stomach (pylorus) to the anal opening. In humans this fairly narrow (about 1 in./2.
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rectum

[′rek·təm]
(anatomy)
The portion of the large intestine between the sigmoid flexure and the anus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

rectum

the lower part of the alimentary canal, between the sigmoid flexure of the colon and the anus
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Dobbs also said when Helleson searched her anal cavity, she irritated a cyst and caused her "severe and continuing pain and discomfort."
In August 2009, a Saudi militant unsuccessfully tried to assassinate Prince Mohammed bin Nayef, Saudi Arabia's counter-terrorism chief, with what was initially believed to be a bomb in his anal cavity, but later turned out to have been hidden in his underwear.