The terminal portion of the large intestine, extending from the sigmoid colon to the anal canal.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "rectum" in a sentence
"Biology: The lining of the rectum is very thin and a ready route for disease and easy to rupture during the vigorous thrusting of anal sex — easy to contaminate your blood with fecal matter – the sphincter muscle of the anus can be damaged by too many intrusions making one incontinent – hemorrhoids and anal sex are surely incompatible."
"Iraqi man with magnet in rectum causes bomb scare at LAX - Boing Boing"
"At the opened pelvic bone, use a sharp knife to make cuts to free the large intestine and rectum from the pelvic area."