-stomy

(redirected from -ostomy)
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-stomy

suff.
A surgical operation in which an artificial opening is made into a specified organ or part: colostomy.

[Greek stoma, opening, mouth + -y.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

-stomy

n combining form
(Surgery) indicating a surgical operation performed to make an artificial opening into or for a specified part: cytostomy.
[from Greek -stomia, from stoma mouth]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

-stomy

a combining form used in the names of surgical operations that involve the establishment of an artificial opening into or between the part or parts specified by the initial element: colostomy.
[< Greek -stomia, derivative of stóma mouth. See -stome, -y3]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.