Sigmoid Colon

lower part of the large intestine that connects to the rectum (Anatomy)

The sigmoid colon (pelvic colon; sigmoid flexure) forms a loop which averages about 40 cm. in length, and normally lies within the pelvis, but on account of its freedom of movement it is liable to be displaced into the abdominal cavity.
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Sigmoid colon n. See sigmoid flexure. Sigmoid colon The final portion of the large intestine that empties into the rectum. [more]Sigmoid colon - Community and Resources

Noun
1. the s-shaped curve between the descending colon and the rectum
(synonym) sigmoid flexure
(hypernym) colon
(part-holonym) large intestine

[SIG-moyd KO-lun]
The S-shaped section of the colon that connects to the rectum.