What it means
The word comes from sigma, the Greek letter S. The sigmoid colon lies in the lower left abdomen and joins the descending colonKOH-lunThe main part of the large intestine, between the small intestine and the rectum.col/o colonFull entry to the rectumREK-tumThe last part of the large intestine, between the colon and the anus, where stool is held until it leaves the body.Full entry . A sigmoidoscopy looks at it and the rectum with a scope, and a sigmoid colostomy is an opening of this part of the colon onto the abdomen.