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 ?
The larvae (glochidia) of Ligumia recta, like those of most unionid species, are obligate parasites on fish.
Many of the reported host species for Ligumia recta were discovered by identifying glochidia on naturally infested fish; however, many reported hosts were not verified with laboratory infestations.