Colostomy

n. operation performed on the colon (main part of the large intestine)

A colostomy is a surgical procedure that involves connecting a part of the colon onto the anterior abdominal wall, leaving the patient with an opening on the abdomen called a stoma. This opening is formed from the end of the large intestine drawn out through the incision and sutured to the skin. After a colostomy, feces leave the patient's body through the stoma, and collect in a pouch attached to the patient's abdomen which is changed when necessary.
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Ostomy is a surgical procedure used to create an opening for urine and feces to be released from the body. [more]Colostomy - Community and Resources

Noun
1. a surgical operation that creates an opening from the colon to the surface of the body to function as an anus
(hypernym) ostomy
(part-meronym) stoma

An altered exit from the colon by diverting from a hole in the colon through the wall of the abdomen. A colostomy is commonly performed by severing the colon to attach the end leading to the stomach to the skin through the wall of the abdomen. The end of the colon that leads to the rectum is closed off and becomes dormant. This is known as a "Hartmann’s Colostomy". There are other types of colostomy procedures, but this one is the most common. Usually a colostomy is performed for infection, blockage, or in rare instances, severe trauma of the colon. This is not an operation to be taken lightly. It demands the close attention of both patient and doctor. A colostomy is often performed so that an infection can be stopped and/or the affected colon tissues can heal.