rectum

The terminal portion of the large intestine, extending from the sigmoid colon to the anal canal.

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.

The terminal part of the large intestine; — so named because supposed by the old anatomists to be straight. See Illust. under digestive.

The terminal part of the large intestine through which feces pass.

the terminal section of the alimentary canal; from the sigmoid flexure to the anus