of, pertaining to, or for the rectum.

1870–75; rect(um) + -al1

rectally, adverb
postrectal, adjective
prerectal, adjective
subrectal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rectal (ˈrɛktəl)
of or relating to the rectum

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1872; see rectum.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

rectal rec·tal (rěk'təl)
Of, relating to, or situated near the rectum.

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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Example sentences
The job consisted of taking the temperature every four hours of two to three
  foot long alligators- with a rectal thermometer.
The rats' rectal temperatures lowered after the injection, and the effect
  lasted for an hour and a half.
The facial tube is loosely attached to the rectal wall by areolar tissue in
  order to allow of distension of the viscus.
The first two tests were performed by digital rectal examination and then by
  prostate specific antigen testing.
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