noun, plural rectums, recta [rek-tuh] . Anatomy.
the comparatively straight, terminal section of the intestine, ending in the anus.

1535–45; < Neo-Latin rēctum (intestīnum) the straight (intestine) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rectum (ˈrɛktəm)
n , pl -tums, -ta
the lower part of the alimentary canal, between the sigmoid flexure of the colon and the anus
[C16: shortened from New Latin rectum intestinum the straight intestine]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1540s, from L. intestinum rectum "straight intestine," in contrast to the convolution of the rest of the bowels, from neut. pp. of regere "to straighten" (see right). A loan-translation of Gk. apeuthysmeon enteron, "the name given to the lowest part of the large intestine
by Galen, who so called it because he dissected only animals whose rectum (in contradistinction to that of man) is really straight" [Klein].
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rectum rec·tum (rěk'təm)
n. pl. rec·tums or rec·ta (-tə)
The terminal portion of the large intestine, extending from the sigmoid flexure to the anal canal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
rectum   (rěk'təm)  Pronunciation Key 
Plural rectums or recta
The last section of the digestive tract, extending from the colon to the anus, in which feces is stored for elimination from the body.

rectal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

rectum definition

The outermost portion of the large intestine. Feces are stored in the rectum until they are passed out of the body through the anus.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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