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 ?
In children whose rectums remained enlarged after this therapy, enemas or stimulant laxatives were used.
The study used abdominal X-rays to identify the children with excess stool in their rectums.
So it makes a difference if the baby is born vaginally, encountering the first bacteria from its mother's rectum, or by caesarean section, which exposes the new-born baby to a completely different, reduced variety of bacteria.