n. The terminal part of the large intestine through which feces pass.
the GNU version of the Collaborative International Dictionary of English
n. The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Illust. under digestive.
The Century Dictionary and Cyclopedia
n. In anatomy and zoology, a terminal section of the intestine, ending in the anus: so called from its comparatively straight course in man; the lower bowel: more fully called intestinum rectum.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the terminal section of the alimentary canal; from the sigmoid flexure to the anus
Word Usage
"Iraqi man with magnet in rectum causes bomb scare at LAX - Boing Boing"