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.

rectum

the lower part of the alimentary canal, between the sigmoid flexure of the colon and the anus
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.