/ Dictionary / Index O ostomy: Meaning and Definition of Find definitions for: os•to•my Pronunciation: (os'tu-mē), [key] — pl. -mies. any of various surgical procedures, as a colostomy, in which an artificial opening is made so as to permit the drainage of waste products either into an appropriate organ or to the outside of the body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ostomy (Thesaurus) ostmark ostosis Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language