co·los·to·my

[kuh-los-tuh-mee]
noun, plural co·los·to·mies. Surgery.
1.
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.
2.
the opening so constructed.

Origin:
1885–90; colo- + -stomy

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
colostomy (kəˈlɒstəmɪ) [Click for IPA pronunciation guide]
 
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
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Colostomy is always a great word to know.
So is gobo. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

colostomy
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)
n.

  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
The dead bowel tissue is removed and a colostomy or ileostomy is performed.
Unfortunately, the accident crushed some of his organs and left him needing a
  colostomy bag to go to the bathroom.
Sometimes the colostomy is needed only until the lower colon has healed, and
  then it can be reversed.
Colostomy is a surgical procedure that brings one end of the large intestine
  out through the abdominal wall.
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