The rectum and sigmoid colon considered as a unit; the term is also applied to the junction of the sigmoid colon and rectum.
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rec·to·sig·moid .rek-tō-'sig-.mȯid n the distal part of the sigmoid colon and the proximal part of the rectum
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n.
the region of the large intestine around the junction of the sigmoid colon and the rectum.
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rec·to·sig·moid (rek″to-sigґmoid) 1. pertaining to the rectum and sigmoid colon. 2. the rectum and the sigmoid colon considered together.Medical dictionary. 2011.