adjective Anatomy.
pertaining to or involving the colon and rectum: colorectal cancer.

colo- + rectal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colorectal (ˌkəʊləʊˈrɛktəl)
of or relating to the colon and 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

by 1918, from colon (2) + rectum.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

colorectal co·lo·rec·tal (kō'lə-rěk'təl)
Relating to the colon and the rectum, or to the entire large bowel.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In other cancer risks, screening tests for prostate cancer and colorectal
  cancer found nothing suspicious, the report says.
Due to your age, you are more at risk for colorectal cancer.
Treatment for colorectal cancer includes surgery, chemotherapy, and radiation.
These tests can find precancerous polyps and colorectal cancers at stages early
  enough for complete removal and cure.
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