/ Dictionary / Index C costectomy: Meaning and Definition of Find definitions for: cos•tec•to•my Pronunciation: (ko-stek'tu-mē, kô-), [key] — pl. -mies. excision of part or all of a rib. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cost-cut cost-effective Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language