noun, plural colostomies. Surgery.
the construction of an artificial opening from the colon through the abdominal wall, thus bypassing a diseased portion of the lower intestine and permitting the passage of intestinal contents.
the opening so constructed.

1885–90; colo- + -stomy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colostomy (kəˈlɒstəmɪ)
n , pl -mies
the surgical formation of an opening from the colon onto the surface of the body, which functions as an anus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1888, from colon (2) + Gk. stoma "opening."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

colostomy co·los·to·my (kə-lŏs'tə-mē)

  1. Surgical construction of an artificial excretory opening from the colon.

  2. The opening created by such a surgical procedure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
colostomy   (kə-lŏs'tə-mē)  Pronunciation Key 
Surgical construction of an opening from the colon through the abdominal wall to the outside of the body for the purpose of excretion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Unfortunately, the accident crushed some of his organs and left him needing a
  colostomy bag to go to the bathroom.
He survived the surgery, but will have to wear a colostomy bag for the rest of
  his life.
Colostomy is a surgical procedure that brings one end of the large intestine
  out through the abdominal wall.
The dead bowel tissue is removed and a colostomy or ileostomy is performed.
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